221015-42-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221015-42-5 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, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 221015-42:
(8*2)+(7*2)+(6*1)+(5*0)+(4*1)+(3*5)+(2*4)+(1*2)=65
65 % 10 = 5
So 221015-42-5 is a valid CAS Registry Number.