23931-65-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 23931-65-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,9,3 and 1 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 23931-65:
(7*2)+(6*3)+(5*9)+(4*3)+(3*1)+(2*6)+(1*5)=109
109 % 10 = 9
So 23931-65-9 is a valid CAS Registry Number.