| 摘要 |
A compound of formula I, or a pharmaceutically acceptable salt thereof: wherein X<1 >represents hydrogen, halogen, C1-6 alkyl, trifluoromethyl or C1-6 alkoxy; X<2 >represents hydrogen or halogen; Y represents a chemical bond, an oxygen atom, or a -NH- linkage; Z represents an optionally substituted aryl or heteroaryl group; R<1 >represents hydrocarbon, a heterocyclic group, trifluoromethyl, -SO2R<a>, -SO2NR<a>R<b>, -COR<a>, -CO2R<a >or -CONR<a>R<b>; and R<a >and R<b >independently represent hydrogen, hydrocarbon or a heterocyclic group; pharmaceutical compositions including the compound and methods for treating anxiety, convulsions and cognitive disorders are disclosed.
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