221321-60-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221321-60-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,3,2 and 1 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 221321-60:
(8*2)+(7*2)+(6*1)+(5*3)+(4*2)+(3*1)+(2*6)+(1*0)=74
74 % 10 = 4
So 221321-60-4 is a valid CAS Registry Number.