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471-56-7

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471-56-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 471-56-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,7 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 471-56:
(5*4)+(4*7)+(3*1)+(2*5)+(1*6)=67
67 % 10 = 7
So 471-56-7 is a valid CAS Registry Number.

471-56-7Relevant articles and documents

Hemisynthetic secofriedelane triterpenes with inhibitory activity against the growth of human tumor cell lines in vitro

Moiteiro, Cristina,Manta, Cesar,Justino, Fatima,Tavares, Regina,Curto, Maria Joao M.,Pedro, Madalena,Nascimento, Maria Sao Jose,Pinto, Madalena

, p. 1193 - 1196 (2004)

Seco acids 7 and 9 and hydroxylated analogues 5 and 6 derived from friedelane triterpenes were synthesized stereoselectively in high yields. Compounds 5-9 were evaluated for their ability to inhibit in vitro the growth of three human tumor cell lines, MCF-7 (breast adenocarcinoma), NCI-H460 (non-small cell lung cancer), and SF-268 (CNS cancer). Only compounds 7 and 9 were found to possess significant growth inhibitory effects, exhibiting GI 50 values that range from 24.6 to 32.8 μM and 10.9 to 17.6 μM, respectively.

Basic Autoxidation of Friedelin

Nishihama, Tadaaki,Takahashi, Takeyoshi

, p. 2117 - 2126 (2007/10/02)

Base-catalized autoxidation of a triterpene ketone, friedelin, in the presence of potassium t-butoxide gave four products, and their structures and formation mechanism were investigated.The common intermediate to these compounds was suggested to be 4-hydroperoxyfriedelan-3-one, not friedelane-2,3-dione. 3-Oxafriedel-1-ene-2-carboxylic acid was a dehydration product of the main product, 2-hydroxy-3-oxafriedelane-2-carboxylic acid.

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