91991-57-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91991-57-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,9,9 and 1 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 91991-57:
(7*9)+(6*1)+(5*9)+(4*9)+(3*1)+(2*5)+(1*7)=170
170 % 10 = 0
So 91991-57-0 is a valid CAS Registry Number.