81722-81-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81722-81-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,2 and 2 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81722-81:
(7*8)+(6*1)+(5*7)+(4*2)+(3*2)+(2*8)+(1*1)=128
128 % 10 = 8
So 81722-81-8 is a valid CAS Registry Number.