| 摘要 |
<p>A compound of the formula: <CHEM> wherein Y is <CHEM> R is hydrogen, C1-C5 alkyl, C1-C5 alkanoyl, or C7-C9 phenylalkyl, and X is hydrogen, C1-C5alkoxy, or halogen being useful for the treatment of senile dementia, psychoneurosis, and/or amnesia.</p> |
