The present invention provides the compound or its pharmaceutically acceptable salt of the d2 dopamine receptor stimulating activity of display strength indicated by leading to formula (I): wherein R1 is cyano etc.; R2 and R3 is hydrogen atom etc.; R4 is C1-6 alkyl etc.; R5 is C1-6 alkyl, halogenated C1-6 alkyl, naphthenic base, naphthenic base C1-6 alkyl, aralkyl etc.; R6 and R7 is respectively hydrogen, C1-6 alkyl, halogenated C1-6 alkyl, naphthenic base, C1-6 alkoxy C 1-6 alkyl, R12R13N-C1-6 alkyl etc.. The present invention also provides the medical composition and its uses comprising the compound.本發明提供顯示强力的多巴胺D2受體刺激活性的由通式(I)表示的化合物或其藥學上可接受的鹽:其中R1爲氰基等;R2和R3爲氫原子等;R4爲C1-6烷基等;R5爲C1-6烷基、鹵代C1-6烷基、環烷基、環烷基C1-6烷基、芳烷基等;R6和R7各自爲氫、C1-6烷基、鹵代C1-6烷基、環烷基、C1-6烷氧基C1-6烷基、R12R13N-C1-6烷基等。本發明還提供包含所述化合物的藥物組合物及其用途。