221537-40-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221537-40-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,3 and 7 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 221537-40:
(8*2)+(7*2)+(6*1)+(5*5)+(4*3)+(3*7)+(2*4)+(1*0)=102
102 % 10 = 2
So 221537-40-2 is a valid CAS Registry Number.