Fujisawa Pharmaceutical Company, Ltd.

Wakunaga Seiyaku Kabushiki Kaisha

Shunso Hatono

Akira Yazaki

Satoshi Inoue

Yasuhiro Kuramoto

Norihiro Hayashi

Masaharu Yokomoto

Shinobu Maruyama

Haruyo Mochizuki

Kuramoto Yasuhiro

Noda Shuichiro

Quinolone derivative or salt thereof and antibacterial containing the

A tricyclic compound represented by the general formula (1) and salts thereof are disclosed. ##STR1## A method for producing the tricyclic compound and salts thereof, and an antimicrobial agent containing the tricyclic compound and salts thereof as an active ingredient are also disclosed.

Tricyclic compound or salts thereof, method for producing the same and

A tricyclic compound represented by the general formula (1) and salts thereof. ##STR1## A method for producing the tricyclic compound and salts thereof, and an antimicrobial agent containing the tricyclic compound and salts thereof as an active ingredient are also disclosed.

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Hiroshima, Japan

Shunso Hatono