1221-16-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1221-16-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,2 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1221-16:
(6*1)+(5*2)+(4*2)+(3*1)+(2*1)+(1*6)=35
35 % 10 = 5
So 1221-16-5 is a valid CAS Registry Number.