NOVEL ANTIBIOTIC DERIVATIVES, PROCESS FOR THEIR PREPARATION, AND USE THEREOF

摘要

Compounds represented by formula (I), (wherein R<1> represents amino or an organic residue bound via nitrogen, R<2> represents carboxy or its derivative, and X represents hydrogen, methoxy or formylamino, provided that, when R<1> represents acetylamino or amino and X represents hydrogen, R<2> does not represent p-nitrobenzyloxycarbonyl nor benzhydryloxycarbonyl) and salts thereof possess an excellent antibacterial effect, thus being used as antibacterial agents.