28021-91-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 28021-91-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,0,2 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 28021-91:
(7*2)+(6*8)+(5*0)+(4*2)+(3*1)+(2*9)+(1*1)=92
92 % 10 = 2
So 28021-91-2 is a valid CAS Registry Number.