Compound of general formula (I) below: in which: - R 1 , R 2 , R 3 , R 4 , R 5 and R 6 represent, independently of each other, H, a (C 1 -C 20 )alkyl group or a (C 1 -C 20 )alkylene-(C 6 -C 10 )aryl group; said alkyl, alkylene and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; - X 1 , X 2 and X 3 are chosen, independently of each other, from the group constituted by: H,-C(O)N(Re)(Rd), (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, (C 2 -C 20 )alkynyl and (C 6 -C 10 )aryl, with Re and Rd being, independently of each other, H or a (C 1 -C 20 )alkyl group, said alkyl, alkenyl and alkynyl groups possibly comprising one or more heteroatoms and/or one or more (C 6 -C 10 )arylenes in their chain and possibly being substituted with a (C 6 -C 10 )aryl; said alkyl, alkenyl, alkynyl and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; - Y 1 , Y 2 and Y 3 represent, independently of each other, a C(O)OH group or a group of formula (II) below: in which: - the radicals Ri are chosen, independently of each other, from the group constituted by: H, halogen, N 3 , (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, (C 2 -C 20 )alkynyl and (C 6 -C 10 )aryl, said alkyl, alkenyl and alkynyl groups possibly comprising one or more heteroatoms and/or one or more (C 6 -C 10 )arylenes in their chain and possibly being substituted with a (C 6 -C 10 )aryl; said alkyl, alkenyl, alkynyl and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; and at least one of the radicals Y 1 , Y 2 and Y 3 being a group of formula (II); or a pharmaceutically acceptable salt thereof. - R 1 , R 2 , R 3 , R 4 , R 5 and R 6 represent, independently of each other, H, a (C 1 -C 20 )alkyl group or a (C 1 -C 20 )alkylene-(C 6 -C 10 )aryl group; said alkyl, alkylene and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; - X 1 , X 2 and X 3 are chosen, independently of each other, from the group constituted by: H,-C(O)N(Re)(Rd), (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, (C 2 -C 20 )alkynyl and (C 6 -C 10 )aryl, with Re and Rd being, independently of each other, H or a (C 1 -C 20 )alkyl group, said alkyl, alkenyl and alkynyl groups possibly comprising one or more heteroatoms and/or one or more (C 6 -C 10 )arylenes in their chain and possibly being substituted with a (C 6 -C 10 )aryl; said alkyl, alkenyl, alkynyl and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; - Y 1 , Y 2 and Y 3 represent, independently of each other, a C(O)OH group or a group of formula (II) below: in which: - the radicals Ri are chosen, independently of each other, from the group constituted by: H, halogen, N 3 , (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, (C 2 -C 20 )alkynyl and (C 6 -C 10 )aryl, said alkyl, alkenyl and alkynyl groups possibly comprising one or more heteroatoms and/or one or more (C 6 -C 10 )arylenes in their chain and possibly being substituted with a (C 6 -C 10 )aryl; said alkyl, alkenyl, alkynyl and aryl groups possibly being substituted with one or more substituents chosen from organic acid functions; and at least one of the radicals Y 1 , Y 2 and Y 3 being a group of formula (II); or a pharmaceutically acceptable salt thereof. - the radicals Ri are chosen, independently of each other, from the group constituted by: H, halogen, N 3 , (C 1 -C 20 )alkyl, (C 2 -C 20 )alkenyl, (C 2 -C 20 )alkynyl and (C 6 -C 10 )aryl, <EOS>