99980-23-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 99980-23-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,9,8 and 0 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 99980-23:
(7*9)+(6*9)+(5*9)+(4*8)+(3*0)+(2*2)+(1*3)=201
201 % 10 = 1
So 99980-23-1 is a valid CAS Registry Number.