221141-81-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221141-81-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,1,4 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221141-81:
(8*2)+(7*2)+(6*1)+(5*1)+(4*4)+(3*1)+(2*8)+(1*1)=77
77 % 10 = 7
So 221141-81-7 is a valid CAS Registry Number.