Patent ID: 7884087

Claim:
A water-soluble amide compound of hyaluronic acid which comprises at least one repetitive unit of the following general formula: wherein: R═NR 6 R 7 , R 1 , R 2 , R 3 , R 4 ═H; R 5 ═CO—CH 3 ; R 6 ═is H; R 7 ═is a aliphatic, aromatic, arylaliphatic, cycloaliphatic, or heterocyclic group, substituted or unsubstituted, with the proviso that R does not form an amide bond with a medicinal agent, and wherein the water-soluble amide compound of hyaluronic acid is a cross-linked compound wherein part of the carboxy groups of the D-glucuronic residue form inner or inter-molecular esters with the alcoholic functions of the same polysaccharide chain or other chains respectively.