Tanabe Seiyaku Company, Limited

Susumu Hatsuno

Totaro Yamaguchi

Satoshi Ohshima

Mitsuyoshi Wagatsuma

A cephalosporin compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkyl group, a carboxy(lower)alkyl group, a hydroxy(lower)alkyl group, a carbamoyl(lower)alkyl group, an N-(lower)alkyl-carbamoyl(lower)alkyl group, a cycloalkyl group, a carboxycycloalkyl group, or a tetrazolylmethyl group, R.sup.2 is a hydrogen atom, a lower alkyl group, a formyl group or a lower alkanol group, R.sup.3 is a hydrogen atom, or R.sup.2 and R.sup.3 are combined together to form an aralkylidene group, or a pharmaceutically acceptable salt thereof which is useful as an antimicrobial agent, and process for their preparation.

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Kawaguchi, Japan

Susumu Hatsuno