[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch2][Ring1][Branch1][C@@H1][Branch1][P][C@@H1][C@@H1][Branch1][N][C][=Branch1][C][=O][C][=Branch1][C][=O][O][Ring1][#Branch1][O][O][O]"}, {"from": "gpt", "value": "The molecule is a ketoaldonolactone obtained by formal intramolecular condensation between the carboxy group and the 4-hydroxy group of L-xylo-hex-2-ulonic acid."}]