| 摘要 |
<p>The present invention relates to cepham-derivatives and to a process for their preparation, having proper substituents at C-2 position, i.e. heterocyclylthio or acyloxy group. They are potent protease inhibitors, in particular human leucocyte elastase (HLE) inhibitors. These inhibitors can be synthesised by way of a substitution reaction starting from known cephem compounds having a 2-position suitable leaving group.</p> |
