12221-71-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 12221-71-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,2,2 and 1 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 12221-71:
(7*1)+(6*2)+(5*2)+(4*2)+(3*1)+(2*7)+(1*1)=55
55 % 10 = 5
So 12221-71-5 is a valid CAS Registry Number.