[{"from": "human", "value": "Could you provide a description of this molecule? [C][Branch2][Ring2][=C][C@@H1][C@H1][Branch1][S][C@@H1][Branch1][N][C@H1][Branch1][Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][O][N][O][O][C@H1][C@@H1][Branch2][Ring1][Ring2][C@H1][Branch1][S][C@@H1][Branch1][N][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][=Branch1][C][=O][O][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is a heparan composed of a backbone of repeating beta-D-glucuronosyl-(1->4)-alpha-D-glucosamine units joined by (1->4)-linkages. It is functionally related to a D-glucopyranuronic acid. It is a tautomer of a heparosan D-glucuronic acid zwitterion."}]