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187851-95-2

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187851-95-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187851-95-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,8,5 and 1 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 187851-95:
(8*1)+(7*8)+(6*7)+(5*8)+(4*5)+(3*1)+(2*9)+(1*5)=192
192 % 10 = 2
So 187851-95-2 is a valid CAS Registry Number.

187851-95-2Relevant articles and documents

Determination of the relative and absolute stereochemistry of fostriecin (CI-920)

Boger, Dale L.,Hikota, Masataka,Lewis, Bryan M.

, p. 1748 - 1753 (1997)

The absolute stereochemistry of fostriecin (1, CI-920), a potent antitumor antibiotic presently in Phase I clinical trials at NCI, was determined to be 5R,8R,9R,11R. 2D 1H-1H NMR NOE experiments conducted on the cyclic phosphate derivative 2 and acetonide 4 revealed a syn-diol stereochemical relationship between C8 and C9 and an anti-diol stereochemical relationship between C9 and C11, respectively. The 5R absolute configuration assignment was confirmed by synthesis of the degradation product 8 previously disclosed. Additional degradation studies of 1 to provide 7 and chiral-phase HPLC comparison with a sample of known chirality established the absolute stereochemistry of C11 to be R. This, along with the relative stereochemical assignments established the full set of absolute stereochemistry assignments for 1.

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