Toyama Chemical Co., Ltd.

Hideyoshi Nagaki

Isamu Saikawa

Shuntaro Takano

Hirokazu Narita

Yoshinori Konishi

Isao Kitayama

Yozo Todo

Tetsuo Yamafuji

Katsuyuki Nagumo

Mikako Miyajima

Chosaku Yoshida

Takihiro Inaba

Yasuo Watanabe

Ryuko Takeno

Jun Nitta

Keiichi Tanaka

Shinzaburo Minami

Tomoya Shimotori

Shinji Makino

Shunjiro Misumi

Nobuyuki Matsubara

Yoriko Nagai

This invention relates to a 4H-1-benzopyran-4-one derivative represented by the formula: ##STR1## or a salt thereof, a process for producing the same and a pharmaceutical composition comprising the same as active ingredient.

4H-1-benzopyran-4-one derivative or its salt, process for producing the

This invention relates to a process for industrially producing a 1-substituted aryl-1,4-dihydro-4-oxonaphthyridine derivative and a salt thereof which are useful as an antibacterial agent, and also to intermediates therefor and processes for producing the intermediates.

Nicotinic acid derivatives

Process for producing 1-substituted aryl-1,4-dihydro-4-oxonaphthyridine

This invention relates to a novel 4-oxo-1,4-dihydronicotinic acid derivative ##STR1## or a salt thereof, wherein R.sup.1 is hydrogen or carboxyl-protecting group;

4-oxo-1,4-dihydronicotinic acid derivatives, salts thereof, and

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Toyama, Japan

Hideyoshi Nagaki