99980-71-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 99980-71-9 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, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 99980-71:
(7*9)+(6*9)+(5*9)+(4*8)+(3*0)+(2*7)+(1*1)=209
209 % 10 = 9
So 99980-71-9 is a valid CAS Registry Number.