221120-57-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221120-57-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,1,2 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 221120-57:
(8*2)+(7*2)+(6*1)+(5*1)+(4*2)+(3*0)+(2*5)+(1*7)=66
66 % 10 = 6
So 221120-57-6 is a valid CAS Registry Number.