81-66-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81-66-3 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 1 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 81-66:
(4*8)+(3*1)+(2*6)+(1*6)=53
53 % 10 = 3
So 81-66-3 is a valid CAS Registry Number.