BENZENE DERIVATIVES, THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS IN WHICH THEY ARE PRESENT

The present invention relates to compounds of the formula in which: - R1 is a hydrogen atom or a halogen atom; - R2 is a cyclohexyl or a phenyl; - R3 is a cycloalkyl containing from 3 to 6 carbon atoms; - R4 is a hydrogen atom, an alkyl containing from 1 to 6 carbon atoms or a cycloalkyl containing from 3 to 6 carbon atoms; and - A is a group selected from: -CO-CH2-, -CH(Cl)-CH2-, -CH(OH)-CH2-, -CH2-CH2-, -CH=CH- and -C~C-, and to their addition salts with mineral or organic acids. These compounds are active on the immune system. The present invention further relates to a method of preparing said compounds and to the pharmaceutical compositions in which they are present.