202131-72-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 202131-72-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,2,1,3 and 1 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 202131-72:
(8*2)+(7*0)+(6*2)+(5*1)+(4*3)+(3*1)+(2*7)+(1*2)=64
64 % 10 = 4
So 202131-72-4 is a valid CAS Registry Number.