81431-13-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81431-13-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,4,3 and 1 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81431-13:
(7*8)+(6*1)+(5*4)+(4*3)+(3*1)+(2*1)+(1*3)=102
102 % 10 = 2
So 81431-13-2 is a valid CAS Registry Number.
81431-13-2Relevant articles and documents
FUSED AZETIDINONES FROM 2-KETO-DIHYDROPYRIMIDINES.
Atmani, A.,Kajima, M.
, p. 2611 - 2612 (2007/10/02)
Cycloaddition of ketenes to 2-keto dihydropyrimidines give the title compounds.These constitute a new kind of cephalosporins keto-aza analogs.