[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a malate ester obtained by the formal condensation of the two carboxy groups of malic acid with two molecules of ethanol respectively. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C][O][C][=Branch1][C][=O][C][C][Branch1][Branch2][C][=Branch1][C][=O][O][C][C][O]"}]