| abstract |
A quinoline derivative of the formula ##STR1## wherein Z is an amino group or a halogen atom, and R 1 , R 2 and R 3 are the same or different and each represents a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms, n and an ester thereof and a salt of the derivative or the ester and processes for preparation thereof. These compounds show excellent antibacterial activity and are useful as antibacterial agents. |