Abstract: (Wherein n is an integer of from 0 to 3; R1 is substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, or a substituted or unsubstituted aromatic heterocyclic group; R2 is halogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, a substituted or unsubstituted aromatic heterocyclic group, —COR8, or the like; R3 and R4 may be the same or different, and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aralkyl, —COR12, or the like) For example, provided are adenosine A2A receptor antagonists comprising, as the active ingredient, a thiazole derivative represented by a general formula (I), or a pharmaceutically acceptable salt thereof, and the like.

Abstract: It is intended to provide an agent for treating and/or preventing sleep disorder containing as an active ingredient a thiazole derivative represented by the general formula (I) (in the formula, R1 represents a five-membered aromatic heterocyclic group containing at least one oxygen atom or the like, R2 represents halogen or the like, and R3 represents —NR10R11 (in the formula, R10 and R11 are the same or different and represent a hydrogen atom or the like) or the like) or a pharmacologically acceptable salt thereof.

Abstract: A CB2 receptor modulator comprising an imidazole derivative represented by the general formula (I): [wherein, R1 represents optionally substituted lower alkyl or the like; R2 represents optionally substituted cycloalkyl or the like; R3 represents optionally substituted aryl or the like; and n represents an integer of 0 to 3] or a pharmaceutically acceptable salt thereof as an active ingredient, and the like are provided.

Abstract: (Wherein n is an integer of from 0 to 3; R1 is substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, or a substituted or unsubstituted aromatic heterocyclic group; R2 is halogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, a substituted or unsubstituted aromatic heterocyclic group, —COR8, or the like; R3 and R4 may be the same or different, and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aralkyl, —COR12, or the like) For example, provided are adenosine A2A receptor antagonists comprising, as the active ingredient, a thiazole derivative represented by a general formula (I), or a pharmaceutically acceptable salt thereof, and the like.

Abstract: A fused heterocycle derivative represented by the general formula (I): (wherein R1 represents optionally substituted lower alkyl, or the like; R2 represents an optionally substituted aliphatic heterocyclic group, or the like; R3 represents —C(=Z)NR5R6 (wherein R5 and R6 represent optionally substituted lower alkyl, or the like, and Z represents an oxygen atom or the like), or the like; n represents an integer of 1 to 3; and W represents C—R5 (wherein R5 represents a hydrogen atom or the like)) or a pharmaceutically acceptable salt thereof, and the like are provided.

Abstract: (Wherein n is an integer of from 0 to 3; R1 is substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, or a substituted or unsubstituted aromatic heterocyclic group; R2 is halogen, substituted or unsubstituted lower alkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, a substituted or unsubstituted aromatic heterocyclic group, —COR8, or the like; R3 and R4 may be the same or different, and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aralkyl, —COR12, or the like) For example, provided are adenosine A2A receptor antagonists comprising, as the active ingredient, a thiazole derivative represented by a general formula (I), or a pharmaceutically acceptable salt thereof, and the like.

Abstract: The present invention provides an &agr;2c-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 &agr;2c-adrenoceptor (for example, Parkinson's disease, L-DOPA-induced dyskinesia, tardive dyskinesia and depression) and the like.