R 2956

    WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 585090

CAS#: 42438-88-0

Description: R 2956 is a steroid anti-androgen that stimulates cell growth.

Chemical Structure

R 2956
CAS# 42438-88-0

Theoretical Analysis

MedKoo Cat#: 585090
Name: R 2956
CAS#: 42438-88-0
Chemical Formula: C21H28O2
Exact Mass: 312.2089
Molecular Weight: 312.453
Elemental Analysis: C, 80.73; H, 9.03; O, 10.24

Price and Availability

This product is not in stock, which may be available by custom synthesis. For cost-effective reason, minimum order is 1g (price is usually high, lead time is 2~3 months, depending on the technical challenge). Quote less than 1g will not be provided. To request quote, please email to sales @medkoo.com or click below button.
Note: Price will be listed if it is available in the future.

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Synonym: R 2956; R2956; R-2956

IUPAC/Chemical Name: Estra-4,9,11-trien-3-one, 17-hydroxy-2,2,17-trimethyl-, (8alpha,17beta)-


InChi Code: InChI=1S/C21H28O2/c1-19(2)12-16-13(11-18(19)22)5-6-15-14(16)7-9-20(3)17(15)8-10-21(20,4)23/h7,9,11,15,17,23H,5-6,8,10,12H2,1-4H3/t15-,17-,20-,21-/m0/s1

SMILES Code: C[C@@]12[C@@](C)(O)CC[C@@]1([H])[C@@]3([H])CCC4=CC(C(C)(C)CC4=C3C=C2)=O

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >3 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 312.453 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Ostgaard K, Wibe E, Eik-Nes KB. Steroid responsiveness of the human cell line NHIK 3025. Acta Endocrinol (Copenh). 1981 Aug;97(4):551-8. PubMed PMID: 7270009.

2: Brown TR, Rothwell SW, Sultan C, Migeon CJ. Inhibition of androgen binding in human foreskin fibroblasts by antiandrogens. Steroids. 1981 Jun;37(6):635-48. PubMed PMID: 6457421.

3: Takayasu S. Effect of antiandrogens on the binding of androgen to cytosol and nuclei of hamster sebaceous glands. Arch Dermatol Res. 1979 Feb 23;264(1):49-54. PubMed PMID: 443861.

4: Lakey WH, Bruchovsky N, Callaway T, Comeau T, Lieskovsky G, Rennie P, Shnitka T, Wilkin P. Androgen receptors in benign and malignant prostatic tissue. Trans Am Assoc Genitourin Surg. 1979;71:19-22. PubMed PMID: 94714.