639-26-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 639-26-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,3 and 9 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 639-26:
(5*6)+(4*3)+(3*9)+(2*2)+(1*6)=79
79 % 10 = 9
So 639-26-9 is a valid CAS Registry Number.