[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][N][C][C@H1][Branch2][Ring2][Ring2][C@H1][Branch2][Ring1][#C][C@H1][C@@H1][Branch2][Ring1][Ring2][C@H1][Branch1][S][C][C@@][Branch1][Ring2][O][Ring1][=Branch1][Branch1][=Branch1][C][=Branch1][C][=O][O][O][O][N][C][=Branch1][C][=O][C][O][O]"}, {"from": "gpt", "value": "The molecule is an N-acetylneuraminic acid that is N-acetyl-alpha-neuraminic acid in which the 9-hydroxy group has been replaced by an acetamido group. It has a role as an epitope. It is functionally related to a N-acetylneuraminic acid."}]