81991-72-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81991-72-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,9,9 and 1 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 81991-72:
(7*8)+(6*1)+(5*9)+(4*9)+(3*1)+(2*7)+(1*2)=162
162 % 10 = 2
So 81991-72-2 is a valid CAS Registry Number.