221890-91-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221890-91-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,8,9 and 0 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221890-91:
(8*2)+(7*2)+(6*1)+(5*8)+(4*9)+(3*0)+(2*9)+(1*1)=131
131 % 10 = 1
So 221890-91-1 is a valid CAS Registry Number.