23531-99-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 23531-99-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,5,3 and 1 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 23531-99:
(7*2)+(6*3)+(5*5)+(4*3)+(3*1)+(2*9)+(1*9)=99
99 % 10 = 9
So 23531-99-9 is a valid CAS Registry Number.