| 摘要 |
Compounds of formula I <IMAGE> I wherein R1 is hydrogen or lower alkyl, R2, R3 and R4 are, independently, hydrogen, halogen lower alkyl, lower alkoxy or CONR5R6 wherein R5 and R6 are, independently, hydrogen or lower alkyl, and x y is -CH2-CH= or -CH=C=. are useful as central dopaminergic agents and prolactin secretion inhibitors.
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