39831-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 39831-21-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,8,3 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 39831-21:
(7*3)+(6*9)+(5*8)+(4*3)+(3*1)+(2*2)+(1*1)=135
135 % 10 = 5
So 39831-21-5 is a valid CAS Registry Number.