31930-55-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31930-55-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,9,3 and 0 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 31930-55:
(7*3)+(6*1)+(5*9)+(4*3)+(3*0)+(2*5)+(1*5)=99
99 % 10 = 9
So 31930-55-9 is a valid CAS Registry Number.