| 摘要 |
The present invention provides bioactive compounds of the general formula: <IMAGE> wherein R is H, (C1-C4)alkyl, (C3-C6)cycloalkyl, (C3-C6)cycloalkyl(C1-C4)alkyl, allyl, (C6-C10)aryl or (C1-C4)alkylCO2Y; Y is H, (C1-C4)alkyl or (C6-C10)aryl; each X is individually H, (C1-C4)alkyl, (C6-C10)aryl, (C3-C6)cycloalkyl(C1-C4)alkyl, or (C3-C6)cycloatkyl; the bond represented by-is present or is absent; and the pharmaceutically acceptable salts thereof, and methods for using said compounds to stimulate receptors in the mammalian nervous systems.
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