The present invention contemplates provision of a quinolone antibacterial agent and a drug for the treatment of infectious diseases, which exhibit potent antibacterial activity and higher selective toxicity against Gram-positive and Gram-negative bacteria
Novel 4-oxoquinoline-3-carboxylic acid compounds of the formula: STR1 wherein R2 is 1-pyrrolidinyl which may have 1 to 2 substituents selected from the group consisting of (i) C1 -C6 alkyl, (ii) amino-(C1 -Csub