Patent ID: 7951802

Claim:
A compound of formula (I); or a pharmaceutically acceptable salt thereof, wherein Ring X represents a thiazole ring; R 1 represents a 5-7 membered non-aromatic hydrocarbon cyclic group optionally and independently substituted with 1-4 substituent(s) selected from the group consisting of a halogen atom, an oxo group, an ethylenedioxy group, a C 1-6 alkyl group, a C 1-6 alkoxy group, a C 1-6 hydroxyalkyl group, —C(O)OH, a (C 1-6 alkyl)amino group, a di(C 1-6 alkyl)amino group and -Ra-Rb; wherein R a represents a single bond or —CH 2 —; wherein R b represents a 4-7 membered non-aromatic heterocyclic group, a C 6-10 aryl group or a 5-6 membered heteroaryl group, optionally and independently substituted with 1-4 substituent(s) selected from the group consisting of a halogen atom and a C 1-6 alkyl group; wherein R 2 represents a single bond or a carbonyl group; wherein R 3 represents hydrogen, a hydroxyl group, a C 1-6 alkyl group, a C 1-6 alkoxy group, a C 1-6 haloalkyl group, a di(C 1-6 alkyl)amino group or a 4-7 membered non-aromatic heterocyclic group wherein at least one ring heteroatom is a nitrogen atom, optionally and independently substituted with 1-4 C 1-6 alkyl group(s); and wherein R 4 represents hydrogen or a C 1-6 alkyl group.