23309-39-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 23309-39-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,3,0 and 9 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 23309-39:
(7*2)+(6*3)+(5*3)+(4*0)+(3*9)+(2*3)+(1*9)=89
89 % 10 = 9
So 23309-39-9 is a valid CAS Registry Number.