91721-28-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91721-28-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,7,2 and 1 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 91721-28:
(7*9)+(6*1)+(5*7)+(4*2)+(3*1)+(2*2)+(1*8)=127
127 % 10 = 7
So 91721-28-7 is a valid CAS Registry Number.