71817-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71817-21-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,8,1 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 71817-21:
(7*7)+(6*1)+(5*8)+(4*1)+(3*7)+(2*2)+(1*1)=125
125 % 10 = 5
So 71817-21-5 is a valid CAS Registry Number.