Yoshitomi Pharmaceutical Industries, Ltd.

Satoru Uemori

Kazuhiko Araki

Yoshifumi Ikeda

Tsuyoshi Kuroda

Akihiko Moriguchi

A quinolonecarboxylic acid compound of the formula: ##STR1## wherein R.sup.1 is an alkyl group, a cycloalkyl group, a haloalkyl group, an alkenyl group, mono- or di-alkylamino groups, a phenyl group or a phenyl group substituted by one to three substituents selected from the group consisting of a halogen atom, an alkyl group, an alkoxy group, a hydroxy group, a nitro group or an amino group, R.sup.2 is a hydrogen atom, an alkyl group, a cycloalkyl group, an acyl group or an alkoxycarbonyl group, R.sup.3 is a hydrogen atom, an alkyl group or an aralkyl group, or R.sup.2 and R.sup.3 together with the adjacent nitrogen atom form a heterocyclic ring, R.sup.4 is a hydrogen atom or an alkyl group, R.sup.5 is a hydrogen atom, an alkyl group, an aralkyl group or an ester residue which is readily hydrolyzable in vivo, X is a hydrogen atom, a halogen atom or an alkyl group, n is interger of 1 to 3, and a salt thereof, and pharmaceutical use thereof. The compounds exhibit antibacterial activites and are useful for the treatment of various infectious diseases.

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Fukuoka, Japan

Satoru Uemori