[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a gamma-lactone. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][C][C@@][Ring1][Ring1][C@H1][Ring1][#Branch1][C@@H1][Branch2][Ring1][O][C@@H1][Branch2][Ring1][=Branch1][C][=C][C@@][Branch1][N][C][C][=Branch1][C][=O][C@][Ring1][O][Ring1][#Branch1][O][Branch1][C][C][C][=C][O][O][C][Ring2][Ring1][#Branch1][=O]"}]