4642-61-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 4642-61-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,6,4 and 2 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 4642-61:
(6*4)+(5*6)+(4*4)+(3*2)+(2*6)+(1*1)=89
89 % 10 = 9
So 4642-61-9 is a valid CAS Registry Number.