Disclosed are 7.beta.-(D-5-amino-5-carboxyvaleramido)-7-methoxy-3-cephem-4-carboxylic acids which are substituted in the three position of the "cephem" nucleus by a variety of alkyl, haloalkyl or oxygen, sulfur and nitrogen containing substituents; and the salts, esters and amide derivatives thereof. Certain of the products are obtained by fermentation and others are obtained by synthetic means. The products exhibit activity against gram-negative and gram-positive bacteria.
本文披露了一种7-β-(D-5-
氨基-5-羧基戊二胺基)-7-甲氧基-3-头孢烯-4-
羧酸,其在“头孢烯”核的三位被各种烷基、卤代烷基或含氧、
硫和氮取代基所取代;以及它们的盐、酯和酰胺衍
生物。某些产物通过发酵获得,其他通过合成手段获得。这些产物对革兰氏阴性和革兰氏阳性细菌具有活性。