Kureha Kagaku Kogyo Kabushiki Kaisha

Yoko Onishi

Takayoshi Fujii

Chikao Yoshikumi

Takao Ando

Takao Furusho

Shigeaki Muto

Akihiko Kanno

Isamu Motokawa

Disclosed herein are a cephalosporin derivative represented by the formula (I): ##STR1## wherein R.sup.1 represents a halogenoalkyl group, a salt and ester thereof, a process for producing the same, and a pharmaceutical composition and an antibacterial agent comprising the same.

Cephalosporin derivative, process for producing the same and

Disclosed herein are 7-beta-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-(2-amino-1,3,4- thiadiazolyl-5-thiomethyl)-3-cepheme-4-carboxylic acid, salts thereof and pivaloyloxymethyl ester thereof, and a pharmaceutical composition containing the same as an active ingredient.

Pivaloyloxymethyl

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Mitaka, Japan

Yoko Onishi