A compound of formula below: in which: R 1 and R 2 form a ring with the nitrogen atom to which they are attached, said ring being represented by the formula below: X, m and n having the meanings given hereinafter; R 3 is a hydrogen atom or a C 1-4 alkyl radical; R 4 is a C 1-10 alkyl radical, a C 2-10 alkenyl radical, a C 2-10 alkynyl radical, an aryl radical, a C 1-10 alkyl radical substituted with an aryl radical that is unsubstituted or substituted, a heterocyclic radical, a C 3-7 cycloalkyl radical, a heteroaryl radical, or a heteroaralkyl radical; X represents an oxygen atom, a -CH 2 - radical, a sulfur atom, an SO radical, or an SO 2 radical; m can take the values of 0 or 1; and n can take the values of 0, 1, 2, or 3; and also addition salts of said compound of formula with a pharmaceutically acceptable acid, addition salts of said compound of formula with a pharmaceutically acceptable base, and enantiomers of said compound of formula, wherein said C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl and C 3-7 cycloalkyl radicals may be substituted with one or more radicals selected from a halogen, a C 1-10 alkoxy and a hydroxyl; an aryl radical is an aromatic hydrocarbon-based ring or two condensed aromatic hydrocarbon-based rings; a heterocyclic radical is a saturated or unsaturated, cyclic or polycyclic hydrocarbon-based chain comprising one or more heteroatoms selected from O, S and N; which aryl and heterocyclic radicals may be substituted with one or more groups selected from a C 1-10 alkyl, a C 1-10 alkoxy, an aryl, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; a heteroaryl radical is a cyclic or polycyclic aromatic hydrocarbon-based chain comprising one or more heteroatoms selected from O, S and N, which heteroaryl radical may be substituted with one or more groups selected from a C 1-10 alkyl, a C 1-10 alkoxy, an aryl, a substituted aryl, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; a heteroaralkyl radical is a C 1-10 alkyl radical substituted with a heteroaryl radical, which heteroaralkyl radical may be substituted with one or more groups selected from C 1-10 alkyl, C 1-10 alkoxy, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; and a halogen is a fluorine, chlorine, bromine or iodine atom. R 1 and R 2 form a ring with the nitrogen atom to which they are attached, said ring being represented by the formula below: X, m and n having the meanings given hereinafter; R 3 is a hydrogen atom or a C 1-4 alkyl radical; R 4 is a C 1-10 alkyl radical, a C 2-10 alkenyl radical, a C 2-10 alkynyl radical, an aryl radical, a C 1-10 alkyl radical substituted with an aryl radical that is unsubstituted or substituted, a heterocyclic radical, a C 3-7 cycloalkyl radical, a heteroaryl radical, or a heteroaralkyl radical; X represents an oxygen atom, a -CH 2 - radical, a sulfur atom, an SO radical, or an SO 2 radical; m can take the values of 0 or 1; and n can take the values of 0, 1, 2, or 3; and also addition salts of said compound of formula with a pharmaceutically acceptable acid, addition salts of said compound of formula with a pharmaceutically acceptable base, and enantiomers of said compound of formula, wherein said C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl and C 3-7 cycloalkyl radicals may be substituted with one or more radicals selected from a halogen, a C 1-10 alkoxy and a hydroxyl; an aryl radical is an aromatic hydrocarbon-based ring or two condensed aromatic hydrocarbon-based rings; a heterocyclic radical is a saturated or unsaturated, cyclic or polycyclic hydrocarbon-based chain comprising one or more heteroatoms selected from O, S and N; which aryl and heterocyclic radicals may be substituted with one or more groups selected from a C 1-10 alkyl, a C 1-10 alkoxy, an aryl, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; a heteroaryl radical is a cyclic or polycyclic aromatic hydrocarbon-based chain comprising one or more heteroatoms selected from O, S and N, which heteroaryl radical may be substituted with one or more groups selected from a C 1-10 alkyl, a C 1-10 alkoxy, an aryl, a substituted aryl, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; a heteroaralkyl radical is a C 1-10 alkyl radical substituted with a heteroaryl radical, which heteroaralkyl radical may be substituted with one or more groups selected from C 1-10 alkyl, C 1-10 alkoxy, a halogen, a hydroxyl, a cyano, a trifluoromethyl and a nitro; and a halogen is a fluorine, chlorine, bromine or iodine atom.