| 摘要 |
There are described compounds of the formula (see formula 1) where n is 1, 2 or 3; R1 is hydrogen, formyl, loweralkylcarbonyl, arylloweralkylcarbonyl, loweralkyl, arylloweralkyl, (see formula 2) or (see formula 3), R5 and R6 being independently loweralkyl or alternatively the group (see formula 4) taken as a whole is (see formula 5), (see formula 6), (see formula 7) or (see formula 8) -60- R2 is hydrogen, loweralkyl, loweralkenyl, arylloweralkyl, -CH2C.ident.CH, <IMGS> R7 and R9 being independently loweralkyl or alternatively the group taken as a whole is <IMGS> R3 is hydrogen or loweralkyl; and R4 is hydrogen or loweralkyl; which compounds are useful ae analgesic agents and also for treating various memory dysfunctions.
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