71721-11-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71721-11-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,7,2 and 1 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 71721-11:
(7*7)+(6*1)+(5*7)+(4*2)+(3*1)+(2*1)+(1*1)=104
104 % 10 = 4
So 71721-11-4 is a valid CAS Registry Number.