Patent ID: 8470847

Claim:
A compound of formula (I): wherein: R 1 and R 2 (1) are, independently of one another: a hydrogen atom, a C 1 -C 7 alkyl group, a —CO—(C 1 -C 7 ) alkyl group or a C 3 -C 8 cycloalkyl group, where said alkyl or cycloalkyl group is optionally substituted with one or more groups selected from the group consisting of a halogen atom, hydroxyl, and alkoxy group, a phenyl group optionally substituted with one or more groups selected from the group consisting of a halogen atom, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, hydroxyl, haloalkoxy, haloalkyl, —CN and —NRR′, where R and R′ are as defined below, or a heteroaryl group optionally substituted in any position, including on a nitrogen atom of said heteroaryl, with one or more groups selected from the group consisting of a halogen atom, C 1 -C 4 alkyl, and —NRR′, where R and R′ are as defined below; or (2) form, together with the carbon atom that bears them: a C 4 -C 8 cycloalkyl group, or a 4- to 8-membered saturated heterocyclic group comprising a heteroatom selected from the group consisting of an N, O and S atom, wherein said heterocyclic group is optionally fused with a phenyl group; R 3 is: a linear or branched C 1 -C 7 alkyl group or a C 3 -C 7 alkyl group wherein at least 3 carbon atoms are cyclized, said alkyl group being optionally substituted with one or more groups selected from the group consisting of a halogen atom, hydroxyl, alkoxy, —NRR′, -haloalkyl and —SO 2 —(C 1 -C 4 )alkyl, where R and R′ are as defined hereinafter, a —(CH 2 ) n -heterocyclic group, where n=0, 1, 2 or 3 and where the heterocyclic group comprises between 4 and 8 members and comprises at least one heteroatom selected from the group consisting of an N, O and S atom, where said heterocyclic group is optionally substituted with an oxo group, or a —(CH 2 ) n -heteroaryl group, where n=0, 1, 2 or 3 and where the heteroaryl group comprises 5 or 6 members and comprises one or more heteroatoms selected from the group consisting of nitrogen, oxygen and sulphur; and R 4 is a hydrogen atom, a C 1 -C 4 alkyl group or a C 1 -C 4 alkoxy group; wherein R and R′ are, independently of one another, a hydrogen atom or a C 1 -C 4 alkyl group; or an acid addition salt of formula (I) thereof, or an enantiomer or diastereoisomer thereof, or a mixture thereof.