77991-99-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77991-99-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,9,9 and 1 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 77991-99:
(7*7)+(6*7)+(5*9)+(4*9)+(3*1)+(2*9)+(1*9)=202
202 % 10 = 2
So 77991-99-2 is a valid CAS Registry Number.