| 摘要 |
<p>There are provided compounds of formula (I), wherein A is a hydrogen atom or an organic group, R1 is hydrogen or halogen atom or an organic group, R2 is hydrogen or halogen atom, C1-C4 alkyl or acyloxy group, R3 is hydrogen atom, C1-C4 alkyl or alkoxy, benzyl group or a methylene and R4 is chloro, fluoro, hydrogen atom or an organic group. The compounds of formula (I) are elastase inhibitors. A process for their preparation is also provided, as are pharmaceutical compositions containing them.</p> |
