21612-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21612-21-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,1 and 2 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21612-21:
(7*2)+(6*1)+(5*6)+(4*1)+(3*2)+(2*2)+(1*1)=65
65 % 10 = 5
So 21612-21-5 is a valid CAS Registry Number.