Fluoroquinoline derivative

摘要

Antibacterial fluoroquinoline derivatives and salts thereof of the following formula are stable and have low toxicity and high photostability and low cytotoxicity under light irradiation: <IMAGE> wherein R1 is hydrogen or lower alkyl; R2 is hydrogen, optionally protected amino, optionally protected aminocarbonyl or optionally protected carboxyl; R5 is halogen, lower alkyl or optionally protected hydroxyl or is the same as R2; R6 is lower alkyl; A is CH2, optionally protected nitrogen or oxygen; and n and m are each an integer of from 0 to 4, provided that n +m is an integer of from 1 to 4.