| 摘要 |
Disclosed are compounds of the formula: (see formula I) (wherein R1, R2, R3 and R4 are each H, -CO2R5, optionally substituted aryl or optionally substituted heteroaryl; R5 is alkyl, aryl, arylalkyl or heteroarylalkyl; and R6 is H or alkyl) and their pharmaceutically acceptable salts, intermediates in the synthesis of such compounds, pharmaceutical compositions containing such compounds and methods of using such compounds in the treatment of neurological and psychological disorders.
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