13721-91-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 13721-91-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,7,2 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 13721-91:
(7*1)+(6*3)+(5*7)+(4*2)+(3*1)+(2*9)+(1*1)=90
90 % 10 = 0
So 13721-91-0 is a valid CAS Registry Number.