A monocyclic .beta.-lactam antibiotic having a formamido substituent at the 3S-position, including compounds of the formula (I): ##STR1## and salts thereof wherein R is --SO.sub.3 H; --PO(OH)Y wherein Y is C.sub.1-6 alkoxy, hydroxy, aryloxy, C.sub.1-6 alkyl or aryl; ##STR2## wherein Z represents C.sub.1-6 alkyl or aryl; ##STR3## wherein Z.sup.1 and Z.sup.2 may be the same or different and each represents hydrogen, C.sub.1-6 alkyl, aryl, amino or C.sub.1-6 alkoxy, or Z.sup.1 and Z.sup.2 together form the residue of a heterocyclic ring; --OSO.sub.3 H; or ##STR4## where X is hydrogen or hydroxy; R.sup.1 is an amino, protected amino or carboxylic acylamino group, and R.sup.2 and R.sup.3 are independently selected from hydrogen or a hydrocarbon group of 1 to 18 carbon atoms.
一种单环β-内酰胺类抗生素,在3S位置具有甲酰胺取代基,包括以下式子(I)的化合物及其盐:其中R为--SO3H; --PO(OH)Y,其中Y为C1-6烷氧基,羟基,芳氧基,C1-6烷基或芳基; 其中Z表示C1-6烷基或芳基; 其中Z1和Z2可以相同或不同,每个代表氢,C1-6烷基,芳基,
氨基或C1-6烷氧基,或Z1和Z2一起形成杂环环的残基; --OSO3H; 或其中X为氢或羟基; R1为
氨基,保护
氨基或
羧酸酰胺基,且R2和R3独立选择自1至18个碳原子的碳氢基团。