331-15-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 331-15-7 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, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 331-15:
(5*3)+(4*3)+(3*1)+(2*1)+(1*5)=37
37 % 10 = 7
So 331-15-7 is a valid CAS Registry Number.