The present invention provides compounds represented by the general formula (I): or pharmaceutical acceptable salts thereof, wherein R1 is cyano or the like R2 and R3 are hydrogen or the like R4 is C1-6 alkyl or the like R5 is C1-6 alkyl, halo-C1-6 alkyl, cycloalkyl, cycloalkyl-C1-6 alkyl, aralkyl or the like R6 and R7 are each hydrogen, C1-6 alkyl, halo-C1-6 alkyl, cycloalkyl, C1-6 alkoxy-C1-6 alkyl, R12R13N-C1-6 alkyl or the like, which exhibit potent dopamine D2 receptor stimulating activities. The present invention also provides pharmaceutical compositions containing said compound, and uses thereof.
