Derivatives of penicillanic acid of formula: ##SPC1## In which R represents hydrogen or a radical of formula: ##EQU1## which is easily removable enzymatically, and in which R.sub.1 is hydrogen or straight or branched chain C.sub.1-4 alkyl, phenyl, or phenyl C.sub.1-2 alkyl and R.sub.2 is straight or branched chain C.sub.1-4 alkyl or alkoxy, cyclohexyl, phenyl or phenyl C.sub.1-2 alkyl, together with their pharmaceutically acceptable non-toxic metal salts or addition salts with nitrogen-containing bases, have particularly valuable anti-bacterial properties, especially against Gram-positive and Gram-negative bacteria.
公式为:##
SPC1## 其中R代表氢原子或式为:##EQU1## 的基团,该基团可经酶易于去除,其中R.sub.1为氢原子或直链或支链C.sub.1-4烷基、苯基或苯基C.sub.1-2烷基,R.sub.2为直链或支链C.sub.1-4烷基或烷氧基、环己基、苯基或苯基C.sub.1-2烷基。它们与含氮碱的药用可接受的无毒
金属盐或加成盐具有特别有价值的抗菌性能,特别是对革兰氏阳性和阴性菌。