A compound of formula: in which: • Z 1 and Z 2, identical or different are selected from a hydrogen atom, a (C1-C6)alkyl and a (C1-C6)alkoxy group; - P 5 is selected from the following amino acids residues or amino acid like structures: and - P 1 and P 4, identical or different, are selected from the following ammo acid like structures: m which Z 3 and Z 4, identical or different, are selected from a hydrogen atom and a (C1-C6)alkyl group; - P 3 is selected from the following amino acid residues: - R 1 is selected from: and - R2 is selected from: in which: • m is 0, 1 or 2; • p is 1, 2, 3 or 4; • Z 5 is a halogen atom; • q is 0 or 1; • Z 6 is selected from a (C 1 -C 6)alkyl and a phenyl group, said phenyl group being optionally substituted by an amino group; • Z 7, Z 8 and Z 11, identical or different, are selected from a hydrogen atom, a (C 1 -C 4)alkyl, a tetrahydroquinolynyl and a -(CH 2) i -aryl group with i being 0, 1 or 2, said aryl group being optionally substituted by one, two, three, or four halogen atom(s) or one (C 1 -C 4) alkyl group; and • Z 9 and Z 10, identical or different, are selected from a halogen atom and a (C 1 -C 6)alkyl group; or one of its salts; said compound of formula being in all the possible racemic, enantiomeric and diastereoisomeric isomer forms. • Z 1 and Z 2, identical or different are selected from a hydrogen atom, a (C1-C6)alkyl and a (C1-C6)alkoxy group; - P 5 is selected from the following amino acids residues or amino acid like structures: and - P 1 and P 4, identical or different, are selected from the following ammo acid like structures: m which Z 3 and Z 4, identical or different, are selected from a hydrogen atom and a (C1-C6)alkyl group; - P 3 is selected from the following amino acid residues: - R 1 is selected from: and - R2 is selected from: in which: • m is 0, 1 or 2; • p is 1, 2, 3 or 4; • Z 5 is a halogen atom; • q is 0 or 1; • Z 6 is selected from a (C 1 -C 6)alkyl and a phenyl group, said phenyl group being optionally substituted by an amino group; • Z 7, Z 8 and Z 11, identical or different, are selected from a hydrogen atom, a (C 1 -C 4)alkyl, a tetrahydroquinolynyl and a -(CH 2) i -aryl group with i being 0, 1 or 2, said aryl group being optionally substituted by one, two, three, or four halogen atom(s) or one (C 1 -C 4) alkyl group; and • Z 9 and Z 10, identical or different, are selected from a halogen atom and a (C 1 -C 6)alkyl group; - P 5 is selected from the following amino acids residues or amino acid like structures: and - P 1 and P 4, identical or different, are selected from the following ammo acid like structures: m which Z 3 and Z 4, identical or different, are selected from a hydrogen atom and a (C1-C6)alkyl group; - P 3 is selected from the following amino acid residues: - R 1 is selected from: and - R2 is selected from: • m is 0, 1 or 2; • p is 1, 2, 3 or 4; • Z 5 is a halogen atom; • q is 0 or 1; • Z 6 is selected from a (C 1 -C 6)alkyl and a phenyl group, said phenyl group being optionally substituted by an amino group; • Z 7, Z 8 and Z 11, identical or different, are selected from a hydrogen atom, a (C 1 -C 4)alkyl, a tetrahydroquinolynyl and a -(CH 2) i -aryl group with i being 0, 1 or 2, said aryl group being optionally substituted by one, two, three, or four halogen atom(s) or one (C 1 -C 4) alkyl group; and • Z 9 and Z 10, identical or different, are selected from a halogen atom and a (C 1 -C 6)alkyl group; or one of its salts; said compound of formula being in all the possible racemic, enantiomeric and diastereoisomeric isomer forms.