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42756-57-0

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42756-57-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 42756-57-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,7,5 and 6 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 42756-57:
(7*4)+(6*2)+(5*7)+(4*5)+(3*6)+(2*5)+(1*7)=130
130 % 10 = 0
So 42756-57-0 is a valid CAS Registry Number.

42756-57-0Relevant articles and documents

Marine natural products. XXVIII. The structures of sarasinosides A1, A2, A3, B1, B2, B3, C1, C2, and C3, nine new norlanostane-triterpenoidal oligoglycosides from the palauan marine sponge Asteropus sarasinosum

Kobayashi,Okamoto,Kitagawa

, p. 2867 - 2877 (2007/10/02)

The chemical structures of sarasinosides A1, A2, A3, B1, B2, B3, C1, C2, and C3, nine 30-norlanostane-triterpenoidal oligoglycosides isolated from the Palauan marine sponge Asteropus sarasinosum have been elucidated on the basis of chemical and physicochemical evidence. Sarasinosides A2 (2) and A3 (3) were shown to he the 7,9(11)-diene and 8,14-diene analogs of sarasinoside A1 (1), whereas sarasinosides B2 (7) and B3 (9) were the 7,9(11)-diene and 8,14-diene analogs of sarasinoside B1 (5), respectively. Similar structural correlations of sarasinosides C2 (6) and C3 (8) with sarasinoside C1 (4) were demonstrated. These sarasinosides characteristically contain one mole each of N-acetylglucosamine and N-acetylgalactosamine in their oligosaccharide moieties.

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