[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is major microspecies at pH 7.3 It is a conjugate base of a (R)-5-methyl-tetronic acid."}, {"from": "gpt", "value": "[C][C@@H1][C][=Branch1][=Branch2][=C][C][=Branch1][C][=O][O][Ring1][=Branch1][O-1]"}]