19801-00-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 19801-00-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,0 and 1 respectively; the second part has 2 digits, 0 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 19801-00:
(7*1)+(6*9)+(5*8)+(4*0)+(3*1)+(2*0)+(1*0)=104
104 % 10 = 4
So 19801-00-4 is a valid CAS Registry Number.