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Pharmacopeial Impurities (EP / USP / BP)

Finasteride EP Impurity B

Reference StandardAvailable on request

Finasteride EP Impurity B (CAS 103335-41-7) supplier Zemixal. Request a quote with price, lead time and documents. Catalogue no. ZX-021497.

Pack sizes
Finasteride EP Impurity B chemical structure
CAS number103335-41-7
FormulaC20H29NO3
Molar mass331.4 g/mol
Physical formSolid
HS code38229090
InChIKeyWMSQGMYJYBSBKA-ALHYADCGSA-N
IUPAC namemethyl (1S,3aS,3bS,5aR,9aR,9bS,11aS)-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,5a,6,9b,10,11-dodecahydroindeno[5,4-f]quinoline-1-carboxylate

About Finasteride EP Impurity B

Finasteride EP Impurity B belongs to the Finasteride reference-standard family in the Zemixal catalogue. Key data (Reference Standard): CAS 103335-41-7, formula C20H29NO3 and molar mass 331.4 g/mol. It is handled as a solid.

Common uses in the lab and plant

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

Storage and safety notes

Hazard communication follows GHS (Warning: H361). Our SDS lists exposure controls and first-aid measures.

Order it in 10 mg, 25 mg, 50 mg and 100 mg packs or ask for a bulk quotation. Every shipment includes a certificate of analysis with characterisation data. Send an enquiry through the quote panel and you get a formal offer with Incoterms and delivery time.

Reference standards for Finasteride

See every impurity, metabolite and related compound we list for this API.

Finasteride standards

Typical uses

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

Applications

Pharmaceutical Manufacturing and QCResearch Labs and Universities

Grade guides

Ph. Eur. Grade (European Pharmacopoeia)

Specifications and identifiers

Specifications of Finasteride EP Impurity B
Product nameFinasteride EP Impurity B
Catalogue numberZX-021497
CAS number103335-41-7
IUPAC namemethyl (1S,3aS,3bS,5aR,9aR,9bS,11aS)-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,5a,6,9b,10,11-dodecahydroindeno[5,4-f]quinoline-1-carboxylate
Molecular formulaC20H29NO3
Molar mass331.4 g/mol
Exact mass331.2147
GradeReference Standard
Physical formSolid
XLogP32.6
H-bond donors / acceptors1 / 3
Topological polar surface area55.4 Ų
HS code38229090
InChIKeyWMSQGMYJYBSBKA-ALHYADCGSA-N
SMILESC[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2C(=O)OC)CC[C@@H]4[C@@]3(C=CC(=O)N4)C
PubChem CID11002070
SynonymsFinasteride - Impurity B, Dutasteride Methyl Ester Impurity, Dutasteride methyl ester, 17beta-(Methoxycarbonyl)-4-aza-5alpha-androst-1-en-3-one, Methyl (5alpha,17beta)-3-oxo-4-azaandrost-1-ene-17-carboxylate, 4-Azaandrost-1-ene-17-carboxylic acid, 3-oxo-, methyl ester, (5alpha,17beta)-, Methyl 3-Oxo-4-aza-5alpha-androst-1-ene-17beta-carboxylate, Methyl 4-aza-5alpha-Androsta-1-en-3-one-17beta-Carboxylate, 3-Oxo-4-aza-5alpha-alphandrost-1-ene-17beta-carboxylic Acid Methyl Ester, 3-Oxo-4-aza-5a-androst-1-ene-17b-carboxylic Acid Methyl Ester, Methyl 3-Oxo-4-aza-5alpha-androst-1-ene-17beta-carboxylate (Delta-1-Aza Ester), Dutasteride Impurity 1

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

GHS08 Health hazard
Health hazard

Signal word Warning

  • H361Suspected of damaging fertility or the unborn child

Precautionary statements P203, P280, P318, P405, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of Finasteride EP Impurity B
10 mgQuoted on request
25 mgQuoted on request
50 mgQuoted on request
100 mgQuoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about Finasteride EP Impurity B

Which CAS number identifies Finasteride EP Impurity B?
Finasteride EP Impurity B is registered under CAS 103335-41-7. You may also see it listed as Finasteride - Impurity B, Dutasteride Methyl Ester Impurity, Dutasteride methyl ester. Our catalogue number for this item is ZX-021497.
What are the formula and molar mass of Finasteride EP Impurity B?
For Finasteride EP Impurity B, its formula is C20H29NO3 and its molar mass is 331.4 g/mol. The systematic (IUPAC) name is methyl (1S,3aS,3bS,5aR,9aR,9bS,11aS)-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,4,5,5a,6,9b,10,11-dodecahydroindeno[5,4-f]quinoline-1-carboxylate. InChIKey WMSQGMYJYBSBKA-ALHYADCGSA-N lets you match it in any structure database.
How is Finasteride EP Impurity B used in pharmaceutical QC?
Finasteride EP Impurity B is a characterised reference material linked to Finasteride. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.
What grade and pack sizes are available for Finasteride EP Impurity B?
This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.
Which documents come with Finasteride EP Impurity B?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship Finasteride EP Impurity B to my country?
Yes. Because Finasteride EP Impurity B is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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