UN PROCEDIMIENTO PARA PREPARAR NUEVOS COMPUESTOS DE CEFEM.

摘要

New cephem compounds of the formula : …… wherein… R<1> is amino or acylamino; and… R<9> is a group of the formula: …… or a group of the formula :… -A-N<(+)> (R<1><0>)3… wherein the symbols define certain groups, pharmaceutically acceptable salts thereof and pharmaceutical compositions comprising an effective amount of such compounds in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient. The invention also relates to such compounds wherein the carboxy group is protected and to processes for preparing them.