| 摘要 |
The invention relates to heterocyclic compounds of formula (I) or a salt thereof wherein R<1> is hydrogen or C1-6 alkyl; R<2>, R<3> and R<4> groups are independently hydrogen, halogen or C1-6 alkyl optionally substituted by one or more fluorine atoms, having pharmacological activity, processes for their preparation, to compositions containing them and to their use in the treatment of CNS disorders such as anxiety.
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