[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a monocarboxylic acid that is propanoic acid substituted at C-3 by a 2-methoxyethoxy group. It has a role as a metabolite. It is a monocarboxylic acid and an ether."}, {"from": "gpt", "value": "[C][O][C][C][O][C][C][C][=Branch1][C][=O][O]"}]