664319-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 664319-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,4,3,1 and 9 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 664319-20:
(8*6)+(7*6)+(6*4)+(5*3)+(4*1)+(3*9)+(2*2)+(1*0)=164
164 % 10 = 4
So 664319-20-4 is a valid CAS Registry Number.