[{"from": "human", "value": "What can you tell me about this molecule? [C][C@@H1][Branch1][#C][C][=Branch1][C][=O][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1][O]"}, {"from": "gpt", "value": "The molecule is a carbohydrate acid anion that is the conjugate base of 2,4-didehydro-3-deoxy-L-rhamnonic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a 2,4-didehydro-3-deoxy-L-rhamnonic acid."}]