81931-13-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81931-13-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,9,3 and 1 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81931-13:
(7*8)+(6*1)+(5*9)+(4*3)+(3*1)+(2*1)+(1*3)=127
127 % 10 = 7
So 81931-13-7 is a valid CAS Registry Number.