Dapsone EP Impurity A

Name: Dapsone EP Impurity A
Brand: Vaqora Chemicals
SKU: VQ-030039

About Dapsone EP Impurity A

Listed under CAS 25963-47-7, Dapsone EP Impurity A is a pharmacopeial impurity of Dapsone available from Vaqora Chemicals. Formula C12H11NO3S, molecular weight 249.29 g/mol. Systematically, it is named 4-(4-aminophenyl)sulfonylphenol. Common synonyms include Dapsone - Impurity A and 4-((4-aminophenyl)sulfonyl)phenol.

The product is provided as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

As a characterised impurity of Dapsone, it is used for analytical method development, method validation (AMV) and routine quality-control testing, and it supports ANDA and DMF regulatory filings. It is used across pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 10 mg, 25 mg, 50 mg and 100 mg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Pharmacopeial method verification
Impurity profiling
QC release testing
ANDA / DMF filings

Industries

Related to Dapsone

View every impurity, metabolite and intermediate we list for Dapsone.

Dapsone impurities

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Dapsone EP Impurity A
Catalogue No.	VQ-030039
CAS Number	25963-47-7
IUPAC name	4-(4-aminophenyl)sulfonylphenol
Molecular formula	C₁₂H₁₁NO₃S
Molecular weight	249.29 g/mol
Exact mass	249.046
Grade	Reference Standard
HSN code	38229090
InChIKey	PSHPCZGANRRQDN-UHFFFAOYSA-N
SMILES	C1=CC(=CC=C1N)S(=O)(=O)C2=CC=C(C=C2)O
PubChem CID	117686

Physical properties
Physical form	Solid
LogP (XLogP3)	1.6
H-bond donors / acceptors	2 / 4
TPSA	88.8 Å²
Synonyms	Dapsone - Impurity A, 4-((4-aminophenyl)sulfonyl)phenol, Phenol, 4-[(4-aminophenyl)sulfonyl]-, Phenol, 4-((4-aminophenyl)sulfonyl)-, 4-Amino-4'-hydroxydiphenylsulfone, p-Sulfanilylphenol, 4-((4-Aminophenyl)sulphonyl)phenol, Dapsone Impurity 17, Phenol,4-[(4-aminophenyl)sulfonyl]-, 4-(4'-hydroxyphenylsulfonyl)aniline, 4-(4-Aminobenzene-1-sulfonyl)phenol

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H317May cause an allergic skin reaction
H319Causes serious eye irritation

Precautionary statements: P261, P264 + P265, P272, P280, P302 + P352, P305 + P351 + P338, P321, P333 + P317, P337 + P317, P362 + P364, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Dapsone EP Impurity A?

The CAS Registry Number of Dapsone EP Impurity A is 25963-47-7. It is also known as Dapsone - Impurity A, 4-((4-aminophenyl)sulfonyl)phenol, Phenol, 4-[(4-aminophenyl)sulfonyl]-.

What is the molecular formula and molecular weight of Dapsone EP Impurity A?

Dapsone EP Impurity A has the molecular formula C12H11NO3S and a molecular weight of 249.29 g/mol. Its IUPAC name is 4-(4-aminophenyl)sulfonylphenol.

What is Dapsone EP Impurity A used for?

Dapsone EP Impurity A is supplied as a characterised reference material related to Dapsone. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of Dapsone EP Impurity A can I order?

We supply Dapsone EP Impurity A in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Dapsone EP Impurity A?

Yes. Every lot of Dapsone EP Impurity A is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Dapsone EP Impurity A be shipped internationally?

Yes. Dapsone EP Impurity A is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.