[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][=Branch1][C][=O][N][C@@H1][C@H1][Branch2][Ring1][P][C][C@@][Branch2][Ring1][Ring2][O][C@H1][Ring1][=Branch1][C@@H1][Branch1][#Branch1][C@@H1][Branch1][Ring1][C][O][O][O][C][=Branch1][C][=O][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O][O]"}, {"from": "gpt", "value": "The molecule is a polyanionic polymer obtained by deprotonation of the carboxy groups of [(2->8)-N,O(7)-diacetyl-alpha-D-neuraminosyl]n; major species at pH 7.3."}]