2643-44-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2643-44-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,6,4 and 3 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 2643-44:
(6*2)+(5*6)+(4*4)+(3*3)+(2*4)+(1*4)=79
79 % 10 = 9
So 2643-44-9 is a valid CAS Registry Number.