Sankyo Company, Limited

Yukichi Kishida

Koichi Hirai

Yuji Iwano

Tetsuo Hiraoka

Takuzo Nishimura

Tokio Saito

Novel penicillin and cephalosporin derivatives possessing interferon inducibility and represented by the formula ##STR1## wherein Y represents a hydrogen atom, a halogen atom a nitro group, an alkoxy group or an alkyl group; M represents a protective group for a hydroxyl or carboxyl group; Z represents a group ##STR2## or a group ##STR3## in which D is a hydrogen atom, an acyloxy group, a carbamoyloxy group or a substituted or unsubstituted heterocyclic thio group; A represents a cyano group, a carboalkoxy group or a nitro group; and B represents a hydrogen atom, a cyano group, a carboalkoxy group or a nitro group And process for preparing the same.

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Tokyo, Japan

Yukichi Kishida