7281-81-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7281-81-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,8 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7281-81:
(6*7)+(5*2)+(4*8)+(3*1)+(2*8)+(1*1)=104
104 % 10 = 4
So 7281-81-4 is a valid CAS Registry Number.