642430-71-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642430-71-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,4,3 and 0 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 642430-71:
(8*6)+(7*4)+(6*2)+(5*4)+(4*3)+(3*0)+(2*7)+(1*1)=135
135 % 10 = 5
So 642430-71-5 is a valid CAS Registry Number.