331-71-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 331-71-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,3 and 1 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 331-71:
(5*3)+(4*3)+(3*1)+(2*7)+(1*1)=45
45 % 10 = 5
So 331-71-5 is a valid CAS Registry Number.