Finasteride EP Impurity B
CAS 103335-41-7
Cat. no. C4X-110311 Formula C20H29NO3
MW 331.45
In stock
Impurity profiling of finasteride calls for isolated related substances rather than inferred structures, and Finasteride EP Impurity B is one of the materials kept for that work. The name carries the European Pharmacopoeia designation, identifying it as a steroid-type impurity of the 5-alpha-reductase inhibitor finasteride. Chemically it is a white powder of formula C20H29NO3 and molecular weight 331.45. Analytical groups use it as a peak-identity marker in related-substance chromatograms, as a resolution and system-suitability check, and as a calibrant when the impurity is quantified against an external standard. Pack sizes listed for this item run from 0.01 mg up to 600 mg, covering both method-development trials and larger validation batches. Storage at 2 C to 8 C is recommended, and the material ships at room temperature. Ask for a quotation and the accompanying documents if this line is of interest.
Also known as
Dutasteride methyl ester; 17beta-(Methoxycarbonyl)-4-aza-5alpha-androst-1-en-3-one; Methyl (5alpha,17beta)-3-oxo-4-azaandrost-1-ene-17-carboxylate; Methyl 3-Oxo-4-aza-5alpha-androst-1-ene-17beta-carboxylate; Finasteride EP Impurity B; Methyl 4-aza-5alpha-Androsta-1-en-3-one-17beta-Carboxylate; Methyl 3-Oxo-4-aza-5alpha-androst-1-ene-17beta-carboxylate (Delta-1-Aza Ester); Dutasteride Impurity 1. Further pharmacopoeial and trivial names are recorded on the certificate of analysis.
Pack sizes and lead time
| Pack size | Availability | Quote |
|---|---|---|
| 0.01 mg | In stock | |
| 5 mg | In stock | |
| 10 mg | In stock | |
| 15 mg | In stock | |
| 20 mg | In stock | |
| 25 mg | In stock | |
| 50 mg | In stock | |
| 60 mg | In stock | |
| 100 mg | In stock | |
| 150 mg | In stock | |
| 200 mg | In stock | |
| 270 mg | In stock | |
| 500 mg | 10 days | |
| 600 mg | 10 days |
Content and purity for each pack size are stated per lot on the certificate of
analysis. Prices are quoted per enquiry so that pack size, documentation and shipping requirements
can be confirmed together — no price is published on this site.
What the documents contain
- Certificate of analysis — issued per lot: catalogue and lot number, the value assigned to the material and the analytical basis for it.
- Safety data sheet — supplied for the catalogue item, and the basis for the transport classification used on the shipment.
- Storage and shipping conditions for this item: 2℃ ~ 8℃, Shipping at Room Temperature.
Frequently asked questions
Is a certificate of analysis (COA) available for Finasteride EP Impurity B?
Yes. A batch-specific COA and the MSDS are issued for every lot of Finasteride EP Impurity B (catalogue number C4X-110311). Use the COA link on this page, or email [email protected] with the lot number printed on your label and we will send the matching document.
What pack sizes and lead times are offered?
Pack sizes 0.01 mg, 5 mg, 10 mg, 15 mg, 20 mg, 25 mg, 50 mg, 60 mg, 100 mg, 150 mg, 200 mg, 270 mg are held in stock and typically ship within 1–2 working days Other sizes (500 mg, 600 mg) are quoted with a lead time of approximately 10 days.
How is the purity of Finasteride EP Impurity B documented?
Purity is determined per batch and stated on the COA together with the analytical data used for its assignment. If your method requires a specific grade or a particular pharmacopoeial naming, tell us the requirement when you enquire and we will confirm suitability.
Can you supply a larger quantity or a custom synthesis?
Yes. Quantities above the listed pack sizes are quoted on request, and custom synthesis or isolation from related starting materials can be discussed for compounds not held in stock. Contact [email protected] with the target quantity and required delivery date.
How is Finasteride EP Impurity B shipped?
Shipping conditions for this item: Shipping at Room Temperature. Shipments are packed to maintain the specified storage condition, and the SDS is provided for transport classification.
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