[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a monocarboxylic acid that is propionic acid in which one of the methyl hydrogens is substituted by a cyclopentyl group."}, {"from": "gpt", "value": "[C][C][C][C][Branch1][Ring2][C][Ring1][Branch1][C][C][C][=Branch1][C][=O][O]"}]