[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][Branch1][=C][O][C@@H1][Branch1][=Branch2][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a hexuronic acid that is 3,4-dihydro-2H-pyran-6-carboxylic acid substituted by a hydroxy group at each of the positions 2, 3, and 4 (the 2S,3R,4S-diastereoisomer). It is a conjugate acid of a 4-deoxy-beta-L-threo-hex-4-enopyranuronate."}]