642423-81-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642423-81-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,4,2 and 3 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 642423-81:
(8*6)+(7*4)+(6*2)+(5*4)+(4*2)+(3*3)+(2*8)+(1*1)=142
142 % 10 = 2
So 642423-81-2 is a valid CAS Registry Number.