A class of new cephalosporin compounds (syn-isomer) is now provided, which is useful as antibacterial agent and is represented by the general formula (I)
wherein R1 is an amino group or a protected amino group; R2 is a lower alkyl group, a carboxymethyl group or a protected carboxymethyl group; R3 is a hydrogen atom, a salt-forming cation or a carboxyl-protecting group; A is an unsubstituted or substituted phenyl group, an unsubstituted or substituted furyl group, an unsubstituted or substituted thiazolyl group or an unsubstituted or substituted 3-lower-alkylthiazolio group, and a pharmaceutically acceptable salt or ester thereof.
现提供一类可用作抗菌剂的新型
头孢菌素化合物(异构体),由通式(I)表示,其中 R1 是
氨基或受保护的
氨基;R2 是低级烷基、羧甲基或受保护的羧甲基;R3 是氢原子、成盐阳离子或受保护的羧基;A 是未取代或取代的苯基、未取代或取代的
呋喃基、未取代或取代的
噻唑基或未取代或取代的 3-低级烷基
噻唑基,及其药学上可接受的盐或酯。