23663-42-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 23663-42-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,6,6 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 23663-42:
(7*2)+(6*3)+(5*6)+(4*6)+(3*3)+(2*4)+(1*2)=105
105 % 10 = 5
So 23663-42-5 is a valid CAS Registry Number.