42009-81-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42009-81-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,0,0 and 9 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 42009-81:
(7*4)+(6*2)+(5*0)+(4*0)+(3*9)+(2*8)+(1*1)=84
84 % 10 = 4
So 42009-81-4 is a valid CAS Registry Number.