28809-55-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 28809-55-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,0 and 9 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 28809-55:
(7*2)+(6*8)+(5*8)+(4*0)+(3*9)+(2*5)+(1*5)=144
144 % 10 = 4
So 28809-55-4 is a valid CAS Registry Number.