[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an epsilon-lactone that is oxepan-2-one which is substituted at positions 4 and 7 by methyl and isopropyl groups, respectively."}, {"from": "gpt", "value": "[C][C][C][C][C][Branch1][=Branch2][O][C][=Branch1][C][=O][C][Ring1][Branch2][C][Branch1][C][C][C]"}]