Compound of formula in which - A represents an -(R 1) n - group in which R 1 is an amino acid residue bound by its C-terminal end and n = 1 to 3, each R 1 being identical or different, in which the N-terminal end of said amino acid is unsubstituted or substituted with a -C- -R 2 group in which R 2 is a mono- or polycyclic C 6 -C 14 arylalkyl group; a mono- or polycyclic C 5 -C 14 heteroarylalkyl group that can comprise one or more heteroatoms, which may be identical or different; a mono-or polycyclic C 6 -C 14 arylalkyloxy group or a mono- or polycyclic C 5 -C 14 heteroarylalkyloxy group that can comprise one or more heteroatoms, which may be identical or different, a -C -NH-R 3 or -C -NH-R 3 group in which R 3 is hydrogen; a C 1 -C 12 alkyl group, linear or branched, unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, where R and R' independently represent hydrogen, a linear C 1 -C 12 alkyl or an unsubstituted aryl; an aryl group unsubstituted or substituted with a group selected from OR, NRR', NHR and SR as defined above; an acyl group; a formyl group; a sulphonyl group; a sulphinyl group, a silyl group unsubstituted or substituted unsubstituted or substituted with a mono- or polycyclic C 6 -C 14 aryl group, unsubstituted or substituted with at least one linear or branched C 1 -C 6 alkyl; an allyl group; a sugar residue; a -C -OR 4 group in which R 4 is a linear or branched C 1 -C 12 alkyl unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, as defined above; an amide group;a thioamide group; a sulphonamide group, a -C -R 5 group in which R 5 is a saturated C 5 -C 14 heterocycle comprising 1 or 2 heteroatoms, unsubstituted or substituted with at least one linear or branched C 1 -C 6 alkyl or a group selected from OR, NRR', NHR and SR, where R and R' independently represent hydrogen, a C 1 -C 12 alkyl or an unsubstituted aryl. - B represents a -C -R 6 group in which R 6 is hydrogen; a C 1 -C 12, preferably C 1 -C 6, alkyl, linear or branched, unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, as defined above; an aryl group, unsubstituted or substituted by a group selected from OR, NRR', NHR and SR, as defined above; or else R 6 represents OR 7, in which R 7 is a linear or branched C 1 -C 12, preferably C 1 -C 6, alkyl. - A represents an -(R 1) n - group in which R 1 is an amino acid residue bound by its C-terminal end and n = 1 to 3, each R 1 being identical or different, in which the N-terminal end of said amino acid is unsubstituted or substituted with a -C- -R 2 group in which R 2 is a mono- or polycyclic C 6 -C 14 arylalkyl group; a mono- or polycyclic C 5 -C 14 heteroarylalkyl group that can comprise one or more heteroatoms, which may be identical or different; a mono-or polycyclic C 6 -C 14 arylalkyloxy group or a mono- or polycyclic C 5 -C 14 heteroarylalkyloxy group that can comprise one or more heteroatoms, which may be identical or different, a -C -NH-R 3 or -C -NH-R 3 group in which R 3 is hydrogen; a C 1 -C 12 alkyl group, linear or branched, unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, where R and R' independently represent hydrogen, a linear C 1 -C 12 alkyl or an unsubstituted aryl; an aryl group unsubstituted or substituted with a group selected from OR, NRR', NHR and SR as defined above; an acyl group; a formyl group; a sulphonyl group; a sulphinyl group, a silyl group unsubstituted or substituted unsubstituted or substituted with a mono- or polycyclic C 6 -C 14 aryl group, unsubstituted or substituted with at least one linear or branched C 1 -C 6 alkyl; an allyl group; a sugar residue; a -C -OR 4 group in which R 4 is a linear or branched C 1 -C 12 alkyl unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, as defined above; an amide group;a thioamide group; a sulphonamide group, a -C -R 5 group in which R 5 is a saturated C 5 -C 14 heterocycle comprising 1 or 2 heteroatoms, unsubstituted or substituted with at least one linear or branched C 1 -C 6 alkyl or a group selected from OR, NRR', NHR and SR, where R and R' independently represent hydrogen, a C 1 -C 12 alkyl or an unsubstituted aryl. - B represents a -C -R 6 group in which R 6 is hydrogen; a C 1 -C 12, preferably C 1 -C 6, alkyl, linear or branched, unsubstituted or substituted with a group selected from OR, NRR', NHR and SR, as defined above; an aryl group, unsubstituted or substituted by a group selected from OR, NRR', NHR and SR, as defined above; or else R 6 represents OR 7, in which R 7 is a linear or branched C 1 -C 12, preferably C 1 -C 6, alkyl.