Disclosed is a nitrogen-containing heterocyclic compound represented by formula (I) or a pharmacologically acceptable salt thereof, which has kynurenine production inhibitory activity. (In formula (I), R6 and R7 may be the same or different and each represents a hydrogen atom or the like； R8, R9, R10 and R11 may be the same or different and each represents a hydrogen atom or the like； R1 represents a lower alkyl group which may be substituted by a cycloalkyl group, or the like； and R3 represents an optionally substituted aryl group or an optionally substituted heterocyclic group.)本發明提供一種具有抑制犬尿胺酸產生之作用之式(I)所表示之含氮雜環化合物或其藥理學上所容許之鹽，[化8](式中，R6及R7為相同或不同，表示氫原子等，R8、R9、R10及R11為相同或不同，表示氫原子等，R1表示可經環烷基取代之低級烷基等，R3表示可具有取代基之芳基或可具有取代基之雜環基)。
