428-81-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 428-81-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,2 and 8 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 428-81:
(5*4)+(4*2)+(3*8)+(2*8)+(1*1)=69
69 % 10 = 9
So 428-81-9 is a valid CAS Registry Number.