28105-57-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 28105-57-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,1,0 and 5 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 28105-57:
(7*2)+(6*8)+(5*1)+(4*0)+(3*5)+(2*5)+(1*7)=99
99 % 10 = 9
So 28105-57-9 is a valid CAS Registry Number.