[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a cembrane diterpenoid isolated from Lobophytum michaelae and has been shown to exhibit cytotoxic activity. It has a role as a metabolite and an antineoplastic agent. It is a cembrane diterpenoid, a gamma-lactone, an epoxide, a macrocycle and an acetate ester."}, {"from": "gpt", "value": "[C][/C][=C][\\C][C@@H1][Branch2][Branch1][Branch2][/C][=Branch2][Branch1][Ring1][=C][/C][C@H1][Branch2][Ring2][#Branch1][C@][Branch2][Ring2][C][C@@H1][Branch1][Ring2][O][Ring1][Ring1][C@@H1][C@@H1][Branch1][=N][C@@H1][Branch1][Ring2][C][/-Ring1][#C][O][C][=Branch1][C][=O][C][C][=Branch1][C][=C][C][=Branch1][C][=O][O][Ring1][=N][C][O][C][=Branch1][C][=O][C][/C][O][C][=Branch1][C][=O][C]"}]