2909-55-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 2909-55-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,9,0 and 9 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 2909-55:
(6*2)+(5*9)+(4*0)+(3*9)+(2*5)+(1*5)=99
99 % 10 = 9
So 2909-55-9 is a valid CAS Registry Number.