The present invention provides an α2c-adrenoceptor antagonist comprising, as an active ingredient, a condensed-ring-pyrimidine derivative represented by general formula (I) below or a pharmaceutically acceptable salt thereof useful for treating and/or preventing various diseases induced by hyperactivity of α2c-adrenoceptor (for example, Parkinson's disease, L-DOPA-induced dyskinesia, tardive dyskinesia and depression) and the like.
wherein p represents an integer of 1 to 3;
R1 represents a substituted or unsubstituted heterocyclic group, substituted or unsubstituted aryl, or the like;
R2 represents -N(-R4)(-R5) (wherein R4 and R5 are the same or different, and each represents a hydrogen atom,
substituted or unsubstituted aralkyl, or the like, or R4 and R5 form a substituted or unsubstituted heterocyclic group together with the adjacent nitrogen atom) or the like; and
-Q- represents -N=C(-R7)- [wherein R7 represents -N(-R9) (-R10) (wherein R9 and R10 are the same or different, and each represents substituted or unsubstituted aralkyl, or the like, or R9 and R10 form a substituted or unsubstituted heterocyclic group together with the adjacent nitrogen atom) or the like] or the like}