Impurity reference standards

Finasteride impurity standards

Zemixal lists 15 reference materials related to Finasteride, covering the drug substance itself, its process impurities and the products it forms on storage. Among them are 4 pharmacopoeial impurities.

15reference materials

4pharmacopoeial

Parent API

Finasteride

CAS: 98319-26-7
Formula: C₂₃H₃₆N₂O₂
MW: 372.5 g/mol
Code: ZX-004129

Every standard comes with a certificate of analysis. Structure confirmation data, typically NMR, MS and chromatographic purity, is available on request. Laboratories use them to validate related-substance methods, set specification limits under ICH Q3A and Q3B, and identify unknown peaks in stability samples.

By impurity type

Pharmacopoeial4EP, USP, BP or JP named impurities

Counts are based on product names. One compound can fall into more than one type.

All Finasteride reference materials

1–15 of 15 standards

(4AR,4bS,6aS,7S,9aS,9bS)-N-(1,1-Dimethylethyl)-2,3,4,4a,4b,5,6,6a,7,8,9,9a,9b,10-tetradecahydro-4a,6a-dimethyl-2-oxo-1H-indeno[5,4-f]quinoline-7-carboxamide

CAS: 166896-74-8
Formula: C₂₃H₃₆N₂O₂
MW: 372.5 g/mol

ZX-029504

Des[[N-(1,1-Dimethylethyl)amino]carbonyl] 17-(Propionyl) Finasteride

CAS: 1346604-11-2
Formula: C₂₁H₃₁NO₂
MW: 329.5 g/mol

ZX-039175

Finasteride

CAS: 98319-26-7
Formula: C₂₃H₃₆N₂O₂
MW: 372.5 g/mol

ZX-004129

Finasteride

CAS: 98319-26-7
Formula: C₂₃H₃₆N₂O₂
MW: 372.5 g/mol

ZX-038327

Finasteride Dihydro Carboxylic Acid

CAS: 103335-55-3
Formula: C₁₉H₂₉NO₃
MW: 319.4 g/mol

ZX-029502

Finasteride Dihydro Carboxylic Acid Methyl Ester

CAS: 73671-92-8
Formula: C₂₀H₃₁NO₃
MW: 333.5 g/mol

ZX-029505

Finasteride EP Impurity A

CAS: 98319-24-5
Formula: C₂₃H₃₈N₂O₂
MW: 374.6 g/mol

ZX-024740

Finasteride EP Impurity B

CAS: 103335-41-7
Formula: C₂₀H₂₉NO₃
MW: 331.4 g/mol

ZX-021497

Finasteride EP Impurity C

CAS: 1800205-94-0
Formula: C₂₃H₃₄N₂O₂
MW: 370.5 g/mol

ZX-029500

Finasteride EP Impurity C

CAS: 1329611-51-9
Formula: C₂₃H₃₄N₂O₂
MW: 370.5 g/mol

ZX-036774

Finasteride Impurity D

CAS: 140375-22-0
Formula: C₂₃H₃₆N₂O₂
MW: 372.5 g/mol

ZX-004759

Finasteride Impurity F

CAS: 104214-18-8
Formula: C₂₀H₂₉NO₃
MW: 331.4 g/mol

ZX-029503

Methyl-3-oxo-4-androsten-17β-carboxylate

CAS: 2681-55-2
Formula: C₂₁H₃₀O₃
MW: 330.5 g/mol

ZX-024742

N-Des(1,1-dimethylethyl) N-Cyclohexyl Finasteride

CAS: 133216-45-2
Formula: C₂₅H₃₈N₂O₂
MW: 398.6 g/mol

ZX-029501

Testosterone 17β-Carboxylic Acid

CAS: 302-97-6
Formula: C₂₀H₂₈O₃
MW: 316.4 g/mol

ZX-024741

Questions

Finasteride impurities, answered

How many Finasteride impurity standards does Zemixal list?

The catalogue currently lists 15 compounds for Finasteride, including 4 pharmacopoeial impurities. Each product page shows the CAS number where one is assigned, the structure, formula and molecular weight.

What documents come with a Finasteride impurity standard?

A certificate of analysis travels with every lot. On request we share the characterisation set, usually 1H-NMR, mass spectrum, HPLC purity and IR, and for some materials TGA or water content. Ask for the data before ordering if your QA team needs to review it.

Can Zemixal make a Finasteride impurity that is not listed?

Often yes. Send the structure, name or CAS number with the quantity you need and our sourcing team checks custom synthesis options, usually from 10 mg up to gram scale, with a quoted lead time.

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