A compound of general formula wherein: - R 1 is selected as a C 2 -C 6 -alkyl group or a -(C=O)-R 3 group; - R 2 is selected as an -O-R 4 or a - R 5 R 6 group; - R 3 is selected as a C 1 -C 6 -alkyl group; - R 4 is selected as a C 12 -C 16 -alkyl, C 12 -C 16 -alkenyl, C 12 -C 16 -alkynyl, phenyl, 4-pyranone, C 1 -C 16 -alkylphenyl, C 2 -C 16 -alkenylphenyl, C 3 -C 6 -cycloalkyl, C 1 -C 16 -alkyl-C 3 -C 6 -cycloalkyl, C 2 -C 16 -alkenyl-C 3 -C 6 -cycloalkyl and a C 2 -C 16 -alkynyl-C 3 -C 6 -cycloalkyl group; each of these groups being optionally substituted by one or more substituent(s) selected independently of each other as an hydroxy, amine, C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylcarbonyloxy, phenyl, C 1 -C 6 -alkoxyphenyl, or C 2 -C 6 -alkenylphenyl group optionally substituted by one or more substituent(s) selected independently of each other as a C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl or a C 1 -C 6 -alkylcarbonyloxy group; - R 5 and R 6 are selected independently of each other as a hydrogen atom or a group selected from a C 1 -C 16 -alkyl, C 2 -C 16 -alkenyl, C 2 -C 16 -alkynyl, phenyl, C 1 -C 16 -alkylphenyl, C 2 -C 16 -alkenylphenyl, C 2 -C 16 -alkynylphenyl, C 1 -C 16 -alkoxyindole, C 3 -C 6 -cycloalkyl, C 1 -C 16 -alkyl-C 3 -C 6 -cycloalkyl, C 2 -C 16 -alkenyl-C 3 -C 6 -cycloalkyl and a C 2 -C 16 -alkynyl-C 3 -C 6 -cycloalkyl group; each of these groups being optionally substituted by one or more substituent(s) selected independently of each other as a hydroxy, amine, C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl, C 1 -C 6 -alkylcarbonyloxy, phenyl, C 1 -C 6 -alkoxyphenyl, or a C 2 -C 6 -alkenylphenyl optionally substituted by one or more substituent(s) selected independently of each other from a C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl or a C 1 -C 6 -alkylcarbonyloxy group; - or R 5 and R 6 form, with the nitrogen atom to which they are linked, a heterocycle selected from piperidine, morpholine, hexamethyleneimine or the pyrrolidine, optionally substituted by one or more C 1 -C 6 -alkyl group(s); with the exception of the following compounds: - 4-acetoxy-3,5-dimethoxy-N-morpholino-cinnamamide; - 4-acetoxy-3,5-dimethoxy-N-(2-methylmorpholino)-cinnamamide; - 4-acetoxy-3,5-dimethoxy-N-(3,4,5-trimethoxyphenyl)-cinnamamide. - R 1 is selected as a C 2 -C 6 -alkyl group or a -(C=O)-R 3 group; - R 2 is selected as an -O-R 4 or a - R 5 R 6 group; - R 3 is selected as a C 1 -C 6 -alkyl group; - R 4 is selected as a C 12 -C 16 -alkyl, C 12 -C 16 -alkenyl, C 12 -C 16 -alkynyl, phenyl, 4-pyranone, C 1 -C 16 -alkylphenyl, C 2 -C 16 -alkenylphenyl, C 3 -C 6 -cycloalkyl, C 1 -C 16 -alkyl-C 3 -C 6 -cycloalkyl, C 2 -C 16 -alkenyl-C 3 -C 6 -cycloalkyl and a C 2 -C 16 -alkynyl-C 3 -C 6 -cycloalkyl group; each of these groups being optionally substituted by one or more substituent(s) selected independently of each other as an hydroxy, amine, C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkylcarbonyloxy, phenyl, C 1 -C 6 -alkoxyphenyl, or C 2 -C 6 -alkenylphenyl group optionally substituted by one or more substituent(s) selected independently of each other as a C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl or a C 1 -C 6 -alkylcarbonyloxy group; - R 5 and R 6 are selected independently of each other as a hydrogen atom or a group selected from a C 1 -C 16 -alkyl, C 2 -C 16 -alkenyl, C 2 -C 16 -alkynyl, phenyl, C 1 -C 16 -alkylphenyl, C 2 -C 16 -alkenylphenyl, C 2 -C 16 -alkynylphenyl, C 1 -C 16 -alkoxyindole, C 3 -C 6 -cycloalkyl, C 1 -C 16 -alkyl-C 3 -C 6 -cycloalkyl, C 2 -C 16 -alkenyl-C 3 -C 6 -cycloalkyl and a C 2 -C 16 -alkynyl-C 3 -C 6 -cycloalkyl group; each of these groups being optionally substituted by one or more substituent(s) selected independently of each other as a hydroxy, amine, C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl, C 1 -C 6 -alkylcarbonyloxy, phenyl, C 1 -C 6 -alkoxyphenyl, or a C 2 -C 6 -alkenylphenyl optionally substituted by one or more substituent(s) selected independently of each other from a C 1 -C 6 -alkyl, C 1 -C 6 -hydroxyalkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -thioalkyl or a C 1 -C 6 -alkylcarbonyloxy group; - or R 5 and R 6 form, with the nitrogen atom to which they are linked, a heterocycle selected from piperidine, morpholine, hexamethyleneimine or the pyrrolidine, optionally substituted by one or more C 1 -C 6 -alkyl group(s); - 4-acetoxy-3,5-dimethoxy-N-morpholino-cinnamamide; - 4-acetoxy-3,5-dimethoxy-N-(2-methylmorpholino)-cinnamamide; - 4-acetoxy-3,5-dimethoxy-N-(3,4,5-trimethoxyphenyl)-cinnamamide.