642417-43-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642417-43-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,4,1 and 7 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 642417-43:
(8*6)+(7*4)+(6*2)+(5*4)+(4*1)+(3*7)+(2*4)+(1*3)=144
144 % 10 = 4
So 642417-43-4 is a valid CAS Registry Number.