| 摘要 |
The invention provides a compound of formula (I):wherein R1, R2, R3, and Y have any of the meanings defined in the specification; as well a pharmaceutical composition comprising a compound of formula I; intermediates and methods useful for preparing a compound of formula I; and therapeutic methods for treating drug addiction, Parkinson's disease or depression comprising administering a compound of formula I, to a mammal in need of such treatment.
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