664971-91-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 664971-91-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,4,9,7 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 664971-91:
(8*6)+(7*6)+(6*4)+(5*9)+(4*7)+(3*1)+(2*9)+(1*1)=209
209 % 10 = 9
So 664971-91-9 is a valid CAS Registry Number.