1221931-42-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1221931-42-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,2,1,9,3 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1221931-42:
(9*1)+(8*2)+(7*2)+(6*1)+(5*9)+(4*3)+(3*1)+(2*4)+(1*2)=115
115 % 10 = 5
So 1221931-42-5 is a valid CAS Registry Number.