[{"from": "human", "value": "What can you tell me about this molecule? [C][C@H1][Branch1][Ring1][C][=O][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is 2-methyl-3-oxopropanoate with R configuration at the chiral centre; major microspecies at pH 7.3. It is an enantiomer of a (S)-methylmalonate semialdehyde."}]