The inventions relates to the compounds of formula (I) where: R is a hydrogen atom or a group selected from the (C1d- C6)alkyl and (C3-C7)-cycloalkyl groups, optionally substituted by one or more groups independently selected from a fluorine atom, the (C3-C7)-cycloalkyl, (C2-C4)alkenyl, phenyl, (C1-C6)alkoxy, and hydroxy groups the phenyl group being optionally substituted by one or more (C1-C6)alkoxy groups R1 is a phenyl group optionally substituted by one or more substituants independently selected from halogen atoms, the (C1-C6)alkyl, (C1-C6)alkoxy, halo-(C1C6)alkyl, hydroxy, halo-(C1-C6)alkoxy, (C1-C6)alkyl-thio, and (C1-C6)alkyl-SO2 groups R2 is one or more substituants selected from hydrogen atoms, halogen atoms, the halo-(C1-C6)alkyl, (C1-C6)alkyl, (C3-C7)cycloalkyl, (C3-C7)-cycloalkyl-(C1-C3)alkyl, (C1C6)alkoxy, (C1C6)alkyl-thio, and (C1-C6)alkyl-SO2 groups in the form of a base or an addition salt to an acid. The invention further relates to the use thereof in therapy and to a method for synthesizing same.
