This application discloses antibacterial cephems of the formula:
wherein R1 represents hydrogen, alkyl, alkenyl, heterocyclylalkyl, or aralkyl; R3 is a 5- or 6-membered heterocyclic ring selected from:
or
and X is sulfur or oxygen.
Included also are pharmaceutically acceptable salts and esters of such compounds and pharmaceutical compositions thereof.
本申请公开了式中的抗菌
头孢菌素:其中 R1 代表氢、烷基、烯基、杂环烷基或芳烷基;R3 是选自以下的 5 或 6 元杂环:或 X 是
硫或氧。 还包括此类化合物的药学上可接受的盐和酯及其药物组合物。