| 摘要 |
<p>The present invention provides a compound of formula (I), wherein L is O, S or NH; X is amino, phenyl or a five- or six-membered heterocycle, each of which is optionally substituted; Y is C1-4alkylidene; Z is an optionally substituted five- or six-membered heterocycle; and n is 1 or 2; or a pharmaceutically acceptable salt thereof or a prodrug thereof; processes for their preparation, their use in enhancing cognition and methods of treatment comprising their administration.</p> |
