Patent ID: 8202874

Claim:
A compound of formula (I): wherein: R1 represents a 4-pyridine ring or a halogen atom; R2 represents a hydrogen atom; R3 represents a hydrogen atom; R4 represents: a phenylC 1-3 alkyl group, this group being optionally substituted by 1 to 4 substituents selected from a C 1-6 alkyl group, a halogen atom, a C 1-2 perhalogenated alkyl group, a C 1-3 halogenated alkyl group, a hydroxyl group, a C 1-6 alkoxy group, a C 1-2 perhalogenated alkoxy group, a C 1-6 alkylsulfonyl group, a nitro, a cyano, an amino, a C 1-6 monoalkylamino group, a C 2-12 dialkylamino group, an acetoxy group, and an aminosulfonyl group; and R5 represents a hydrogen atom; or a pharmaceutically acceptable salt thereof.