| 摘要 |
<p>Compounds of formula (I): <IMAGE> (I) wherein: R1 represents a lower alkyl group selected from methyl groups and ethyl groups; R2 represents a hydrogen atom or a methyl group; and R3 represents a group selected from C1-C5 alkoxy groups, and pharmaceutically acceptable acid addition salts thereof have valuable antibiotic activity and are suitable for oral administration. They may be prepared by a variety of synthetic routes.</p> |
