221198-11-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221198-11-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,1,9 and 8 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221198-11:
(8*2)+(7*2)+(6*1)+(5*1)+(4*9)+(3*8)+(2*1)+(1*1)=104
104 % 10 = 4
So 221198-11-4 is a valid CAS Registry Number.