| 摘要 |
<p>A compound of formula (I) in which R1 is carboxy, COO- or protected carboxy, R2 is hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R3 is hydrogen or lower alkyl, and R4 is substituted lower alkyl or substituted lower alkenyl and R5 is hydrogen, or R4 is hydrogen and R5 is heterocyclic group or lower alkyl or R4 is hydrogen and the formula: =N-R5 is N,N-di(lower)alkylimino, or R?4 and R5¿ are combined together to form optionally substituted imino-containing heterocyclic group, or pharmaceutically acceptable salts thereof, having antimicrobial activity.</p> |
