| abstract |
The invention relates to the derivatives of general formula (I) in which: R1 is: a phenyl group or a naphthyl group, it being possible for these two groups to be optionally substituted; R2 and R3 are, independently of one another, a hydrogen atom, a (C1-C6)alkyl, (C3-C7)cycloalkyl or (C3-C7)cycloalkyl(C1-C3)alkylene group, which is optionally substituted; an optionally substituted aryl group; R4 is: a hydrogen atom, a (C1-C6)alkyl, (C3-C7)cycloalkyl or (C3-C7)cycloalkyl(C1-C3)alkylene group, which is optionally substituted; an aryl group optionally substituted with one or more substituents in the form of a base or of an addition salt with an acid. |