Methyl 4-aza-5α-androst-1-en-3-one-17β-carboxylate

4-氮杂-5α-雄甾-1-烯-3-酮-17β-羧酸甲酯

Also known as: Finasteride EP Impurity B, Finasteride Impurity B, Dutasteride Ester Impurity, Dutasteride Methyl Ester Impurity, Dutasteride Related Impurity 4, Methyl 3-oxo-4-aza-5α-androst-1-ene-17β-carboxylate, Methyl 3-oxo-4-aza-5alpha-androst-1-ene-17beta-carboxylate, Methyl 4-aza-5α-androst-1-en-3-one-17β-carboxylate, (4aR,4bS,6aS,7S,9aS,9bS,11aR)-methyl 4a,6a-dimethyl-2-oxo-2,4a,4b,5,6,6a,7,8,9,9a,9b,10,11,11a-tetradecahydro-1H-indeno[5,4-f]quinoline-7-carboxylate

Methyl 4-aza-5α-androst-1-en-3-one-17β-carboxylate (CAS 103335-41-7) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C20H29NO3 and a molecular weight of 331.449 g/mol. It is also known as Finasteride EP Impurity B, Finasteride Impurity B and Dutasteride Ester Impurity. Key properties include a melting point of 280-282ºC (dec.), a boiling point of 478.6±45.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 243.3±28.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

103335-41-7

Jingsj CID

J-1494864-6

Molecular Formula

C₂₀H₂₉NO₃

Chinese Name

4-氮杂-5α-雄甾-1-烯-3-酮-17β-羧酸甲酯

Molecular Weight

331.449 g/mol

Category

Organic Acids

Last updated

8/21/2026