(Wherein n is an integer of from 0 to 3; R
1
is substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl, a substituted or unsubstituted alicyclic heterocyclic group, or a substituted or unsubstituted aromatic heterocyclic group; R
2
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, —COR
8
, or the like; R
3
and R
4
may be the same or different, and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted aralkyl, —COR
12
, or the like)
For example, provided are adenosine A
2A
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.
Wherein n is an integer of from 0 to 3; R
1A
is a 5-membered aromatic heterocyclic group containing at least one oxygen atom; R
2A
is —COR
8
(wherein R
8
is aryl); R
3A
is hydrogen or lower alkyl; and R
12
represents cycloalkyl, aryl, aralkyl, alicyclic heterocyclic group, aromatic heterocyclic group, alicyclic hetocyclic-alkyl, or aromatic heterocyclic-alkyl, and R
1A
, R
2A
, R
3A
and R
12
are individually optionally substituted.