[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a (-)-casbene."}, {"from": "gpt", "value": "[C][/C][=C][\\C][C][/C][=Branch2][Ring1][N][=C][/C][C][Branch2][Ring1][Branch1][/C][=Branch1][P][=C][/C@@H1][C@@H1][Branch1][Branch2][C][Ring1][Ring1][Branch1][C][C][C][C][C][/-Ring1][P][/C][O][/C]"}]