31997-70-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31997-70-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,9,9 and 7 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 31997-70:
(7*3)+(6*1)+(5*9)+(4*9)+(3*7)+(2*7)+(1*0)=143
143 % 10 = 3
So 31997-70-3 is a valid CAS Registry Number.