| abstract |
The invention provides a compound of formula (I), wherein R?1, R2, R3¿, and Y have any of the meanings defined in the specification; as well as 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. |