B 581

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

MedKoo CAT#: 584109

CAS#: 149759-96-6

Description: B 581 is an inhibitor that specifically blocks farnesylated, but not geranylgeranylated or myristylated, oncogenic ras signaling and transformation.

Chemical Structure

B 581
CAS# 149759-96-6

Theoretical Analysis

MedKoo Cat#: 584109
Name: B 581
CAS#: 149759-96-6
Chemical Formula: C22H38N4O3S2
Exact Mass: 470.2385
Molecular Weight: 470.69
Elemental Analysis: C, 56.14; H, 8.14; N, 11.90; O, 10.20; S, 13.62

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: B 581, B-581, B581

IUPAC/Chemical Name: L-Methionine, N-(N-(2-((2-amino-3-mercaptopropyl)amino)-3-methylbutyl)-L-phenylalanyl)-, (S-(R*,S*))-


InChi Code: InChI=1S/C22H38N4O3S2/c1-15(2)20(24-12-17(23)14-30)13-25-19(11-16-7-5-4-6-8-16)21(27)26-18(22(28)29)9-10-31-3/h4-8,15,17-20,24-25,30H,9-14,23H2,1-3H3,(H,26,27)(H,28,29)/t17-,18+,19+,20-/m1/s1

SMILES Code: CSCC[C@@H](C(O)=O)NC([C@H](CC1=CC=CC=C1)NC[C@@H](NC[C@@H](N)CS)C(C)C)=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: >2 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 470.69 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: Cox AD, Garcia AM, Westwick JK, Kowalczyk JJ, Lewis MD, Brenner DA, Der CJ. The CAAX peptidomimetic compound B581 specifically blocks farnesylated, but not geranylgeranylated or myristylated, oncogenic ras signaling and transformation. J Biol Chem. 1994 Jul 29;269(30):19203-6. PubMed PMID: 8034681.

2: Garcia AM, Rowell C, Ackermann K, Kowalczyk JJ, Lewis MD. Peptidomimetic inhibitors of Ras farnesylation and function in whole cells. J Biol Chem. 1993 Sep 5;268(25):18415-8. PubMed PMID: 8360140.