79721-17-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 79721-17-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,7,2 and 1 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 79721-17:
(7*7)+(6*9)+(5*7)+(4*2)+(3*1)+(2*1)+(1*7)=158
158 % 10 = 8
So 79721-17-8 is a valid CAS Registry Number.