405-20-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 405-20-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,0 and 5 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 405-20:
(5*4)+(4*0)+(3*5)+(2*2)+(1*0)=39
39 % 10 = 9
So 405-20-9 is a valid CAS Registry Number.