| 摘要 |
Compounds of formula (I) and pharmaceutically acceptable salts and solvates: where R1 is hydrogen, C1-6alkyl (optionally substituted by hydroxy or C1-4alkoxy), phenyl-C1-4alkyl-, C1-6alkenyl, C1-6alkynyl; R2 is hydrogen or, up to three substituents selected from halogen, NO2, CN, N3, CF3O-, CF3S-, CF3SO2-, CF3CO-, C1-6alkyl, C1-6alkenyl, C1-6alkynyl, C1-6perfluoroalkyl, C3-6cycloalkyl, C3-6cycloalkyl-C1-4alkyl-, C1-6alkyl, C1-6alkylCO-, C3-6cycloalkylO-, C3-6cycloalkylCO-, C3-6cycloalkyl-C1-4alkylO-, C3-6cycloalkyl-C1-4alkylCO-, phenyl, phenoxy, benzyloxy, benzoyl, phenyl-C1-4alkyl-, C1-6alkylS-, C1-6alkylSO2-, (C1-4alkyl)2NSO2-, (C1-4alkyl)NHSO2-, (C1-4alkyl)2NCO-, (C1-4alkyl)NHCO- or CONH2; or -NR5R6 where R5 is hydrogen or C1-4alkyl, and R6 is hydrogen, C1-4alkyl, formyl, -CO2C1-4alkyl or -COC1-4alkyl; or two R2 groups together form a carbocyclic ring that is saturated or unsaturated, optionally interrupted by O or NH; R3 groups and R4 groups are each independently hydrogen or C1-6alkyl and/or the two R3 groups and/or the two R4 groups together form a C3-6spiroalkyl group, provided that at least one R3 or R4 group is not hydrogen; and X is selected from hydrogen, halogen, cyano, alkyl and alkox
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