97991-66-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 97991-66-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,9,9 and 1 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 97991-66:
(7*9)+(6*7)+(5*9)+(4*9)+(3*1)+(2*6)+(1*6)=207
207 % 10 = 7
So 97991-66-7 is a valid CAS Registry Number.