| abstract |
The invention provides a compound of formula (I): n n n wherein R 1 , R 2 , R 3 , 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. |