Antibacterial penicillins of the formula
or a pharmaceutically acceptable salt thereof wherein R1 is a heterocyclic group and R is hydrogen, the residue of certain carboxy protecting groups or the residue of an ester group readily hydrolyzable in vivo having activity against resistant organisms.
式中的抗菌
青霉素类
或其药学上可接受的盐,其中 R1 是杂环基团,R 是氢、某些羧基保护基团的残基或在体内易
水解的酯基团的残基,具有抗耐药
生物的活性。