NEW CEPHEM COMPOUNDS AND PROCESSES FOR PREPARATION THEREOF

摘要

Cephem compounds of the formula: …… wherein… R<1> is amino a substituted amino group;… R<2> is carboxy or a protected carboxy group;… R<3> is a tetrazolyl group having a lower alkynyl group; and… X is -S- or @…… and pharmaceutically acceptable salts thereof, and process for their preparation, and also a pharmaceutical composition comprising, as an effective ingredient, the above compound in association with a pharmaceutically acceptable, substantially nontoxic carrier or excipient. The invention also relates to the starting compounds… R<6a>-S-R<3>… and their preparation.