Patent ID: 6844328

Claim:
A polysaceharidic ester of the compound of formula (I) wherein: R 2 and R 4 are independent from one another, are selected from the group consisting of —NH 2 —, —OH, —OCH 3 , C 1 -C 5 alkyl, and ═O, and the 6-membered ring containing the two nitrogen atoms is optionally aromatic; X and Y are selected from the group consisting of —C(R 5 )═, —CH(R 5 )—, —NH—, and —N═, and wherein R 5 represents —H or C 1 -C 5 alkyl, and the ring including X and Y is optionally aromatic; Z is selected from the group consisting of —O—, —CH(R 10 )—, and —N(R10)—, and wherein R 10 represents —H, C 1 -C 5 alkyl, C 1 -C 5 alkenyl, C 1 -C 5 alkynyl, or a 5-6 membered heterocyclic ring with 1-3 heteroatoms selected from the group consisting of nitrogen, sulphur and oxygen; Ar is 1,4-phenyl, possibly condensed with one or more 5-6-membered aromatic rings, optionally heterocycles, optionally substituted with R 2 as defined above; characterized in that only the primary hydroxy groups present on the monosaccharide units of the polysaccharide are either partially or totally esterified with the γ-carboxylic group of the compounds of formula (I).