31331-18-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31331-18-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,3,3 and 1 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 31331-18:
(7*3)+(6*1)+(5*3)+(4*3)+(3*1)+(2*1)+(1*8)=67
67 % 10 = 7
So 31331-18-7 is a valid CAS Registry Number.