221051-91-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221051-91-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,5 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221051-91:
(8*2)+(7*2)+(6*1)+(5*0)+(4*5)+(3*1)+(2*9)+(1*1)=78
78 % 10 = 8
So 221051-91-8 is a valid CAS Registry Number.