4997-45-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 4997-45-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,9 and 7 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 4997-45:
(6*4)+(5*9)+(4*9)+(3*7)+(2*4)+(1*5)=139
139 % 10 = 9
So 4997-45-9 is a valid CAS Registry Number.