221102-57-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221102-57-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,1,0 and 2 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 221102-57:
(8*2)+(7*2)+(6*1)+(5*1)+(4*0)+(3*2)+(2*5)+(1*7)=64
64 % 10 = 4
So 221102-57-4 is a valid CAS Registry Number.