Novel cephem compounds having, at the 3-position of the cephem nucleus, a group of the formula:
-CH₂-S-A-Y-B
wherein A stands for a further optionally substituted divalent nonionic aromatic heterocyclic group bounded to the adjacent sulfur atom via carbon atom, Y stands for a bond, a sulfur atom, an oxygen atom, NH, CONH, SO₂NH or a divalentC₁-C₆ hydrocarbon chain optionally including one or two selected from the group consisting of a sulfur atom, an oxygen atom, NH group, CONH group and SO₂NH group in the chain; and B stands for a group of the formula:
wherein R³ stands for H or an optionally substituted lower alkyl, R⁴ and R4' each stand for H, OH, an optionally substituted lower alkyl, COOH or CONH or salts thereof, having excellent antibacterial - activities especially against Pseudomonas aeruginosa and keeping effective serum levels over a long period.
在头抱茎核的 3 位上有一个式中基团的新型头抱茎化合物:
-CH₂-S-A-Y-B
其中 A 代表通过碳原子与相邻
硫原子结合的另一个可选取代的二价非离子芳香杂环基团,Y 代表键、
硫原子、氧原子、NH、CONH、SO₂NH 或二价碳氢链,可选包括链中的一个或两个由
硫原子、氧原子、NH 基团、CONH 基团和 SO₂NH 基团组成的组;B 代表式中的一个基团:
其中 R³ 代表 H 或任选取代的低级烷基,R⁴ 和 R4'分别代表 H、OH、任选取代的低级烷基、COOH 或 CONH 或其盐,具有优异的抗菌活性,特别是对
铜绿假单胞菌,并能长期保持有效的血清
水平。