Antibiotic isoxazole derivatives, their production and use.

摘要

The compounds of the formula: wherein R<1> is amino or an organic residue bonded through nitrogen; R<2> is carboxy or a group derivable therefrom; X is hydrogen, methoxy or formylamino, provided that when R<1> is acetylamino or amino and X is hydrogen, R<2> is not paranitrobenzyloxycarbonyl or benzhydryloxycarbonyl or salts thereof exhibit excellent antimicrobial activity, and are utilized as antimicrobial agents.