641-55-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 641-55-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,4 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 641-55:
(5*6)+(4*4)+(3*1)+(2*5)+(1*5)=64
64 % 10 = 4
So 641-55-4 is a valid CAS Registry Number.