Consumer medicine information

Aczone Gel

Dapsone

BRAND INFORMATION

Brand name

Aczone

Active ingredient

Dapsone

Schedule

What is in this leaflet

This leaflet answers some common questions about ACZONE® gel. It does not contain all the available information. It does not take the place of talking to your doctor or pharmacist.

All medicines have risks and benefits. Your doctor has weighed the risks of you using ACZONE® gel against the benefits they expect it will have for you.

If you have any concerns about using this medicine, ask your doctor or pharmacist.

Keep this leaflet with the medicine. You may need to read it again.

What ACZONE® gel is used for

ACZONE® 7.5% w/w (75 mg per gram) gel is used to treat acne in patients 12 years of age and older.

Acne is a characterised by inflamed pimples and non-inflamed pimples on the skin.

ACZONE® gel contains dapsone as the active ingredient which has anti-inflammatory and anti-microbial properties. The exact mechanisms of action of dapsone gel for treating acne are not known. It is thought to act by helping to eliminate microbes as well as having an anti-inflammatory effect in acne.

ACZONE® gel is only available with a doctor’s prescription from pharmacies.

Your doctor may have prescribed ACZONE® gel for another reason.

Ask your doctor if you have any questions about why

ACZONE® gel has been prescribed for you.

Before you use ACZONE® gel

When you must not use it

Do not use ACZONE® gel if:

you have an allergy to dapsone or any of the ingredients listed at the end of this leaflet.
you have been diagnosed with congenital or idiopathic methaemoglobinaemia (decrease of oxygen in your blood caused by a certain type of abnormal red blood cell).
the pump /packaging shows signs of tampering.
the product does not look quite right.
the expiry date on the tube has passed.

If you use this medicine after the expiry date has passed, it may not work effectively.

It is not known whether ACZONE® gel is safe and useful for children under 12 years in acne.

This gel is for topical use only. Avoid contact with eyes, eyelids and mouth.

Before you start to use it

Tell your doctor if:

You have had an allergy to any medicines or any other substances, such as foods, preservatives or dyes.
You are pregnant or intend to become pregnant. It is not known if ACZONE® gel may harm your unborn baby. The use of ACZONE® gel is not recommended during pregnancy.
You are breast feeding or intend to breast feed. You and your doctor will need to decide whether to discontinue nursing.
You have glucose-6-phosphate dehydrogenase (G6PD) deficiency.
You have have been diagnosed with a haemolytic disease such as haemolytic anaemia breakdown of red blood cells).
You are taking oral dapsone and/or antimalarial medications.

Taking other medicines

Tell your doctor if you are taking any other medicines, including any that you buy without a prescription from your pharmacy, supermarket or health food shop.

Tell your doctor if you are taking medicines which include dapsone tablets, trimethoprim/sulfamethoxazole tablets or any antimalarial medications.

If you take these medicines while using ACZONE® gel, you may be more susceptible to certain side effects.

Tell your doctor if you are using any other medicines applied to the skin, such as acne medicines with benzoyl peroxide.

Your doctor will advise you of the same prior to starting to use ACZONE® gel.

Ask your doctor or pharmacist if you have any concerns about using ACZONE® gel as well as other medications.

How to use ACZONE® gel

How much to use

Your doctor will tell you how much gel you need to use each day. Use ACZONE® gel only as prescribed by your doctor.

For acne: apply a thin film of ACZONE® gel once a day to the entire face as well as other areas of the body affected by acne.

Follow all directions given to you by your doctor carefully. The directions may differ from the information contained in this leaflet.

Use ACZONE® gel every day, preferably at about the same time each day, unless your doctor tells you otherwise.

How to use it:

Remove makeup (if present) before applying ACZONE® gel. Wash your face prior to application and gently pat dry before applying ACZONE® gel.

Apply a pea-sized amount of ACZONE® gel as a thin layer to the entire face once a day. In addition, apply a thin layer to other affected areas of the skin where the acne lesions appear once daily as well.

Rub in the gel gently and completely. All skin prone to acne should be treated.

Carefully avoid application of the gel to other areas that are not affected by acne. If the gel is applied to areas that are not required to be treated, wash the gel off.

Wash your hands after applying ACZONE® gel.

Follow your doctor's directions for other routine skin care and the use of make-up. You should talk to your doctor about the use of sunscreens, moisturisers and cosmetics.

Keep ACZONE® gel away from your eyes and mouth. If the gel gets in your eyes, wash them with large amounts of cool water. Contact your doctor if eye irritation continues. Do not use on broken skin.

Ask your doctor or pharmacist any questions you may have.

How long to use it

Treatment with ACZONE® gel is usually recommended for 12 weeks (3 months). Your doctor will decide whether treatment should be continued at the end of this time period.

If you forget to use it

If you miss a dose, do not try to make it up. Continue your normal schedule.

Do not use double the amount to make up for the dose that you missed.

If you use too much (overdose)

If you accidentally put ACZONE® gel in your eye(s), immediately rinse your eye(s) with large amounts of cool water. Contact your doctor if eye irritation continues.

If you think that you or anyone else may have swallowed ACZONE® gel, immediately telephone your doctor or Poisons Information Centre (Australia: telephone 13 11 26; New Zealand: telephone 0800 POISON or 0800 764 766) for advice or go to casualty at your nearest hospital. Do this even if there are no signs of discomfort or poisoning.

While you are using ACZONE® gel

Things you must do

If you become pregnant while using ACZONE® gel, stop use and tell your doctor immediately.

Tell your doctor if your condition gets worse or does not get better while using ACZONE® gel.

If you are about to start any new medicine, tell your doctor and pharmacist that you are using ACZONE® gel.

Things you must not do

Do not give ACZONE® gel to anyone else, even if they have the same condition as you.

Side effects

All medicines can have side effects. Sometimes they are serious, most of the time they are not. You may need medical treatment if you get some of the side effects.

Tell your doctor or pharmacist as soon as possible if you do not feel well while you are using ACZONE® gel.

Check with your doctor as soon as possible if you have any problems while using ACZONE® gel even if you do not think the problems are connected with the medicine or are not listed in this leaflet.

Ask your doctor or pharmacist any questions you may have.

Side effects in acne:

Tell your doctor if you notice any of the following at the application site and they worry you:

dry skin
itching
pain

Less often the following effects have been seen:

erythema (redness of the skin)
scaling of the skin
dryness
stinging/burning of the skin

Use of benzoyl peroxide together with ACZONE® gel, at the same time may cause your skin to temporarily turn yellow or orange at the site of application.

When the active ingredient of ACZONE® gel, dapsone, is taken orally as a tablet, it has been related to the abnormal breakdown of red blood cells (haemolytic anaemia).

If you have glucose-6-phosphate dehydrogenase (G6PD) deficiency, you may have a greater risk for lowering your haemoglobin level. Please note that using ACZONE® gel on the skin is not expected to put enough dapsone in the blood to cause clinical symptoms of haemolytic anaemia, however you should be aware of the signs and symptoms suggestive of this type of anaemia, listed below:

sudden onset of:

back pain
breathlessness
weakness with daily activities
dark-brown urine
high fever and yellow or pale skin

If you experience these signs and symptoms, please discontinue ACZONE® gel and seek immediate medical attention

Dapsone has been known to cause methaemoglobinaemia which is a blood disorder of red blood cells that carry oxygen to the body. Signs and symptoms suggestive of this blood disorder are

shortness of breath
bluish colouring of the skin
headache
tiredness/lack of energy
dizziness.

If you experience these signs and symptoms, please discontinue ACZONE® gel and seek immediate medical attention

After using ACZONE® gel

Storage

Keep your ACZONE® gel in a cool place where the temperature stays below 25°C. Do not put it in the refrigerator or freezer.

Keep the container where children cannot reach it.

Do not leave the top/lid off the container for any length of time to avoid contaminating the gel

Disposal

Discard any remaining gel after 14 weeks from the date of opening.

If your doctor tells you to stop using the gel or it has passed the expiry date, ask your pharmacist what to do with any remaining gel.

Product description

What ACZONE® gel looks like:

Off-white to yellow gel supplied in 30g, 60g and 90g airless pump polypropylene bottles. Also supplied as a 3g physician sample in a tube.

Pack sizes:
3/30/60/90 g sizes

Ingredients

Active ingredient:
Dapsone 7.5% w/w (Each gram contains 75mg of dapsone)

Preservative:
Methyl hydroxybenzoate

Inactive ingredients:
Diethylene glycol monoethyl ether (DGME);
Acrylamide/sodium acryloyldimethyltaurate copolymer;
Isohexadecane;
Polysorbate 80
Purified water

Manufactured by Allergan.

Supplier

AbbVie Pty Ltd
241 O’Riordan Street
Mascot NSW 2020
AUSTRALIA
Toll free: 1800 252 224 (AU)

AbbVie Limited
Wellington 6011
New Zealand
Free phone: 0800 659 912 (NZ)

ACZONE® gel can be identified by registration numbers:
AUST R 266267

Date of preparation:

August 2023

Published by MIMS October 2023

BRAND INFORMATION

Brand name

Aczone

Active ingredient

Dapsone

Schedule

1 Name of Medicine

Dapsone.

2 Qualitative and Quantitative Composition

Each gram of Aczone gel, 7.5% w/w, contains 75 mg of dapsone.
For the full list of excipients, see Section 6.1 List of Excipients.

3 Pharmaceutical Form

Aczone is a topical gel.

4 Clinical Particulars

4.1 Therapeutic Indications

For the topical treatment of acne vulgaris in patients 12 years of age or older.

4.2 Dose and Method of Administration

For dermatological (topical) use only.
Aczone 7.5% w/w gel should only be applied to affected areas. For external use only. Not for oral, ophthalmic or intravaginal use. Not for use on broken skin. If contact with eyes occurs, rinse thoroughly with water.
After the skin is gently washed and patted dry, approximately a pea-sized amount of Aczone 7.5% w/w gel, should be applied in a thin layer to the entire face once daily. In addition, a thin layer may be applied to other affected areas once daily. Aczone 7.5% w/w gel should be rubbed in gently and completely.
Patients should be instructed to wash their hands after application of Aczone 7.5% w/w gel.
If there is no improvement after 12 weeks, treatment with Aczone 7.5% w/w gel should be reassessed.

4.3 Contraindications

Aczone 7.5% w/w gel is contraindicated in individuals who have shown hypersensitivity to any of its components.
Aczone 7.5% w/w gel is contraindicated in individuals with congenital or idiopathic methaemoglobinaemia.

4.4 Special Warnings and Precautions for Use

Haematological effects.

Oral dapsone treatment has produced dose-related haemolysis and haemolytic anaemia. Individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency are more prone to haemolysis with the use of certain drugs. G6PD deficiency is the most prevalent in populations of African, South Asian, Middle Eastern and Mediterranean ancestry.
In clinical studies, there was no evidence of clinically relevant haemolysis or haemolytic anaemia in patients treated with topical dapsone.
Aczone 7.5% w/w gel, should be discontinued if signs and symptoms suggestive of haemolytic anaemia occur. Avoid use of Aczone 7.5% w/w gel in patients who are taking oral dapsone or antimalarial medications because of the potential for haemolytic reactions.
The combination of topical dapsone with trimethoprim/ sulfamethoxazole (TMP/SMX) may increase the likelihood of haemolysis in patients with G6PD deficiency.
Methaemoglobinaemia has been reported for oral dapsone and has been reported in postmarketing cases for topical dapsone. Patients with G6PD deficiency or congenital or idiopathic methaemoglobinaemia are more susceptible to drug-induced methaemoglobinaemia. Use of Aczone 7.5% w/w gel should be avoided in those patients with congenital or idiopathic methaemoglobinaemia.
Signs and symptoms of methaemoglobinaemia may be delayed for some hours after exposure. Initial signs and symptoms of methaemoglobinaemia are characterised by a slate grey cyanosis seen in, for example, buccal mucous membranes, lips and nail beds. Patients should be advised to discontinue Aczone 7.5% w/w gel and seek immediate medical attention in the event of cyanosis.
Dapsone can cause elevated methaemoglobin levels particularly in conjunction with methaemoglobin-inducing agents.

Peripheral neuropathy.

Peripheral neuropathy (motor loss and muscle weakness) has been reported with oral dapsone treatment. No events of peripheral neuropathy were observed in clinical studies with topical dapsone treatment.

Skin.

Skin reactions (toxic epidermal necrolysis, erythema multiforme, morbilliform and scarlatiniform reactions, bullous and exfoliative dermatitis, erythema nodosum, and urticaria) have been reported with oral dapsone treatment. With the exception of urticaria, these types of skin reactions were not observed in clinical studies with topical dapsone treatment.
Topical application of Aczone 7.5% w/w gel followed by benzoyl peroxide in patients with acne vulgaris may result in a temporary local yellow or orange discolouration of the skin and facial hair.

Use in the elderly.

The safety and efficacy of Aczone 7.5% w/w gel have not been established in patients above the age of 65 years.

Paediatric use.

The safety and efficacy of Aczone 7.5% w/w gel have not been established in patients under the age of 12 years.

Effects on laboratory tests.

No data available.

4.5 Interactions with Other Medicines and Other Forms of Interactions

Systemic exposure is lower with once daily Aczone 7.5% w/w gel than with twice daily dapsone gel, 5% w/w. No formal drug-drug interaction studies were conducted with Aczone 7.5% w/w gel.

Trimethoprim-sulfamethoxazole.

A drug-drug interaction study evaluated the effect of the use of dapsone gel, 5% w/w in combination with double strength (160 mg/800 mg) TMP/SMX. During co-administration, systemic levels of TMP and SMX were essentially unchanged, however, levels of dapsone and its metabolites increased in the presence of TMP/SMX. The systemic exposure from Aczone 7.5% w/w gel is expected to be about 1% of that from the 100 mg oral dose, even when co-administered with TMP/SMX.

Topical benzoyl peroxide.

Topical application of Aczone 7.5% w/w gel followed by benzoyl peroxide in patients with acne vulgaris may result in a temporary local yellow or orange discolouration of the skin and facial hair.

Concomitant use with drugs that induce methaemoglobinaemia.

Concomitant use of Aczone 7.5% w/w gel with drugs that induce methaemoglobinaemia such as sulfonamides, acetaminophen, acetanilide, aniline dyes, benzocaine, chloroquine, dapsone, naphthalene, nitrates and nitrites, nitrofurantoin, nitroglycerin, nitroprusside, pamaquine, para‐aminosalicylic acid, phenacetin, phenobarbital, phenytoin, primaquine and quinine may increase the risk for developing methaemoglobinaemia (see Section 4.4 Special Warnings and Precautions for Use).
There is currently limited data on effects of use with topical antibiotics or topical retinoids.

4.6 Fertility, Pregnancy and Lactation

Effects on fertility.

The effects of dapsone on fertility and general reproductive performance were assessed in male and female rats following oral (gavage) dosing. Sperm motility was decreased in male rats that received 2 mg/kg/day or more, with a reduction in sperm count and density also observed in rats treated with 3 mg/kg/day or more (approximately 16 and 24 times the systemic exposure observed in humans under maximal topical use conditions based on AUC comparisons). Reductions in the mean numbers of embryo implantations and viable embryos in untreated females mated with males that had been dosed at 12 mg/kg/day or greater were likely due to reduced numbers or effectiveness of sperm, indicating impairment of male fertility (approximately 95 times the systemic exposure observed in humans under maximal topical use conditions based on AUC comparisons).
Dapsone reduced the mean number of corpora lutea and implantations in female rats treated with 30 mg/kg/day or more from 15 days prior to mating and for 17 days thereafter (approximately 900 times the systemic exposure observed in humans under maximal topical use conditions based on AUC comparisons). Maternal toxicity also occurred at these dose levels. Doses of 12 mg/kg/day did not affect the number of corpora lutea or implantations, which was associated with relative systemic exposures approximately 350 times than that expected clinically.
(Category B3)
Use in pregnancy is not recommended.
There are no adequate and well controlled studies in pregnant women. Dapsone has been shown to have an embryocidal effect (increased early resorptions and decreased live litter size) when administered orally in rats at 75 mg/kg/day and in rabbits at 150 mg/kg/day (approximately 1400 and 400 times the systemic exposure observed in humans under maximal topical use conditions, based on AUC comparisons, respectively). These effects were associated with maternal toxicity.
Dapsone was assessed for effects on perinatal/ postnatal pup development and postnatal maternal behaviour and function in a study in which dapsone was orally administered to female rats daily beginning around the time of implantation and continuing throughout lactation. Maternal toxicity (decreased bodyweight and food consumption) and developmental effects (increase in stillborn pups and decreased pup weight and growth during lactation) were seen at a dapsone dose of 30 mg/kg/day (approximately 900 times the systemic exposure observed in humans under maximal topical use conditions, based on AUC comparisons). In addition, oral dosing with the excipient diethylene glycol monoethyl ether (DGME) alone also increased the incidence of stillbirths in rats at a dose estimated to be only 2 times that given clinically based on body surface area. No effects were observed on the viability, maturation, behaviour, learning ability, or reproductive function of surviving pups following treatment with dapsone or DGME in pregnancy and lactation.
Although systemic absorption of dapsone following topical application of Aczone 7.5% w/w gel is minimal relative to oral dapsone administration, it is known that dapsone is excreted in human milk. Because of the potential for oral dapsone to cause adverse reactions in nursing infants, a decision should be made whether to discontinue nursing or to discontinue Aczone 7.5% w/w gel taking into account the importance of the drug to the mother.

4.7 Effects on Ability to Drive and Use Machines

The effects of this medicine on a person's ability to drive and use machines were not assessed as part of its registration.

4.8 Adverse Effects (Undesirable Effects)

Pre-marketing clinical trials.

A total of 2161 patients were treated with Aczone 7.5% w/w gel for 12 weeks in 2 controlled clinical studies. Adverse drug reactions that were reported in at least 1% of patients treated with either Aczone 7.5% w/w gel or vehicle appear in Table 1.
Most adverse drug reactions were mild in severity. One patient treated with Aczone 7.5% w/w gel discontinued the study due to application site pruritus, which resolved without sequelae.

Cutaneous irritation evaluations, presented in Table 2, were conducted at each study visit in the two clinical studies. Incidences of erythema, scaling, dryness, and stinging/ burning were similar before treatment (baseline visit) and at each subsequent study visit.

In human dermal safety studies in healthy patients, Aczone 7.5% w/w gel did not show any potential for cumulative irritation, sensitisation, phototoxicity or photoallergy.

Experience with oral use of dapsone.

Although not observed in the clinical studies with topical dapsone, serious adverse reactions have been reported with oral use of dapsone, including agranulocytosis, haemolytic anaemia, peripheral neuropathy (motor loss and muscle weakness), and skin reactions (toxic epidermal necrolysis, erythema multiforme, morbilliform and scarlatiniform reactions, bullous and exfoliative dermatitis, erythema nodosum, and urticaria).

Post-marketing experience.

Methaemoglobinaemia has been identified during postmarketing use of topical dapsone in clinical practice. Because it was reported voluntarily from a population of unknown size, estimates of frequency cannot be made (see Section 4.4 Special Warnings and Precautions for Use).

Reporting suspected adverse effects.

Reporting suspected adverse reactions after registration of the medicinal product is important. It allows continued monitoring of the benefit-risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions at www.tga.gov.au/reporting-problems.

4.9 Overdose

Aczone 7.5% w/w gel is not for oral use. If oral ingestion occurs, medical advice should be sought.
For information on the management of overdose, contact the Poisons Information Centre on 13 11 26 (Australia).

5 Pharmacological Properties

5.1 Pharmacodynamic Properties

Mechanism of action.

The anti-inflammatory properties of dapsone result from inhibition of granulocyte cytotoxicity, via inhibition of peroxidases and scavenging of reactive oxygen species. The antimicrobial properties of dapsone result from competitive inhibition of dihydropteroate synthase, a bacterial enzyme necessary for synthesis of folic acid. The mechanism of action of dapsone gel in treating acne vulgaris is not known.

Clinical trials.

The safety and efficacy of once daily use of Aczone 7.5% w/w gel was assessed in two large 12-week multicentre, randomised, double-blind, vehicle-controlled studies (studies 1 and 2). Efficacy was assessed in a total of 4340 patients 12 years of age and older with moderate acne vulgaris, 20 to 50 inflammatory and 30 to 100 non-inflammatory lesions at baseline, who were randomised to receive either Aczone 7.5% w/w gel or vehicle, where vehicle has the same formulation as Aczone 7.5% w/w gel without the active ingredient dapsone.
The co-primary efficacy variables for these studies were:
Proportion of patients with either 0 (none) or 1 (minimal) on the Global Acne Assessment Score at week 12.
Mean reduction in absolute lesion count from baseline at week 12 in: inflammatory lesions; non-inflammatory lesions.
Additional efficacy variables were:
Mean reduction in absolute total lesion count from baseline at week 12.
Percent reduction in lesion count from baseline at week 12 in: total lesions; inflammatory lesions; non-inflammatory lesions.
Success was defined as a score of "none" (score 0) or "minimal" (score 1) on the Global Acne Assessment Score (GAAS) at week 12. The GAAS used a 5-point scale as shown in Table 3. There was an improvement in GAAS and lesion count in both the Aczone 7.5% w/w and vehicle groups. There was a statistically significant treatment effect favouring Aczone 7.5% w/w gel compared to vehicle at week 12 (Table 4).

5.2 Pharmacokinetic Properties

Absorption.

In a pharmacokinetic study, male and female subjects with acne vulgaris were randomised to receive either 2 gram of Aczone gel, 7.5% w/w, topically to the entire face, upper chest, upper back and shoulders once daily for 28 days (N = 19) or 2 gram of dapsone gel, 5%, topically to the same application area twice daily for 28 days (N = 18). Steady state for dapsone was reached within 7 days of dosing for both treatment groups. On day 28, the mean dapsone AUC_0-24h was 282 ± 146 nanogram.h/mL for Aczone gel, 7.5% w/w, given once daily, whereas the mean dapsone AUC_0-24h was 379 ± 142 nanogram.h/mL for dapsone gel, 5%, given twice daily. The daily systemic exposure following once daily application of Aczone gel, 7.5% w/w, was approximately 28.7% lower relative to dapsone gel, 5%, given twice daily. The systemic exposure from Aczone gel, 7.5% w/w is expected to be about 1% of that from a 100 mg oral dose.

Distribution.

Following oral administration, approximately 74% of dapsone is bound to plasma proteins.

Metabolism.

Following oral administration, dapsone is metabolised by two major pathways to form N-acetyl dapsone and dapsone hydroxylamine.

Excretion.

Following oral administration, approximately 85% of the administered dapsone is recovered in urine, mainly as soluble metabolites, and only a small fraction (5% to 15%) is excreted as unchanged drug in humans.

5.3 Preclinical Safety Data

Genotoxicity.

Dapsone was not mutagenic in a bacterial reverse mutation assay (Ames test) using S. typhimurium and E. coli, with and without metabolic activation. Dapsone increased both numerical and structural aberrations in a chromosome aberration assay conducted with Chinese hamster ovary (CHO) cells. Systemic exposure to dapsone did not induce chromosomal aberrations in in vivo micronucleus assays conducted in mice and rats.

Carcinogenicity.

Dapsone was not carcinogenic to rats when orally administered to females for 92 weeks or males for 100 weeks at dose levels up to 15 mg/kg/day (associated with AUC values greater than 460 times the systemic exposure observed in humans under maximal topical use conditions). At higher doses, dapsone has been reported to induce mesenchymal and thyroid tumours in rats.
Topical dapsone at 5% w/w, did not increase the rate of formation of ultraviolet light-induced skin tumours when topically applied to hairless mice in a 12-month photocarcinogenicity study.

6 Pharmaceutical Particulars

6.1 List of Excipients

Diethylene glycol monoethyl ether (DGME); methyl hydroxybenzoate; acrylamide/sodium acryloyldimethyltaurate copolymer; isohexadecane; polysorbate 80 and purified water.

6.2 Incompatibilities

Incompatibilities were either not assessed or not identified as part of the registration of this medicine.

6.3 Shelf Life

24 months.

6.4 Special Precautions for Storage

Store below 25°C. Do not refrigerate or freeze.
Keep tube tightly closed when not in use.

6.5 Nature and Contents of Container

Gel: 7.5% w/w off-white to yellow gel supplied in 30 g, 60 g and 90 g airless pump polypropylene bottles. Also supplied as a 3 g physician sample in a tube.

6.6 Special Precautions for Disposal

Discard any remaining gel after 14 weeks from the date of opening.

6.7 Physicochemical Properties

Chemical structure.

Chemical Name: 4,4'-diaminodiphenylsulfone.
Empirical formula: C₁₂H₁₂N₂O₂S.
Molecular weight: 248.

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