221015-91-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221015-91-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,1 and 5 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221015-91:
(8*2)+(7*2)+(6*1)+(5*0)+(4*1)+(3*5)+(2*9)+(1*1)=74
74 % 10 = 4
So 221015-91-4 is a valid CAS Registry Number.