[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a monocarboxylic acid anion that is the conjugate base of piperonylic acid resulting from the deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a piperonylic acid."}, {"from": "gpt", "value": "[C][O][C][=C][Branch1][Ring2][O][Ring1][Branch1][C][=C][Branch1][Branch1][C][=C][Ring1][#Branch1][C][=Branch1][C][=O][O-1]"}]