Patent ID: 7662800

Claim:
A derivative formed between hyaluronic acid and at least one heterocyclic compound selected from the group consisting of guanine, thymine, cytosine, uracil, 5,6 dihydrouracil, 1-methyluracil, 3-methyluracil, 5-hydroxymethyluracil, 2-thiouracil, N 4 -acetylcytosine, 3-methylcytosine, 5-methylcytosine, 5-hydroxymethylcytosine, 1-methylguanine, 7-methylguanine, N 2 -methylguanine, and N 2 ,N 2 -dimethylguanine; said derivative having at least one ionic bond between said hyaluronic acid and said at least one heterocyclic compound.