Novel penicillins of the formula: ##SPC1## Wherein the ring A is a benzene ring or a 5 or 6-membered heteroaromatic ring containing one or two nitrogen atoms as the hetero atom, on which one or more of lower alkyl, lower alkoxy, lower alkylthio, lower haloalkyl, lower alkylenedioxy, halogen, hydroxyl, nitro, free or protected amino, lower alkylamino, di(lower)alkylamino and lower alkanoylamino may be present, Z is a nitrogen atom or a methylene group, X is an oxygen atom or a sulfur atom, Y is a hydrogen atom, a lower alkoxycarbonyl group or a lower alkanoyl group, R.sub.1 is a free or protected hydroxyl group and R.sub.2 and R.sub.3 are each a hydrogen atom or a halogen atom, and their non-toxic pharmaceutically acceptable salts, and their preparation.
化合物公式为:##
SPC1## 其中环A是苯环或含有一个或两个氮原子作为杂原子的5或6元杂环,其中可以有一个或多个较低的烷基,较低的烷氧基,较低的烷
硫基,较低的卤代烷基,较低的烷基二氧杂环,卤素,羟基,硝基,自由或保护的
氨基,较低的烷基
氨基,二(较低)烷基
氨基和较低的烷酰胺基。Z是一个氮原子或一个亚甲基基团,X是一个氧原子或一个
硫原子,Y是一个氢原子,一个较低的烷氧羰基基团或一个较低的烷酰基基团,R.sub.1是一个自由或保护的羟基,R.sub.2和R.sub.3分别是氢原子或卤素原子,以及它们的非毒性药用可接受盐和制备方法。