[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the (-)-enantiomer of beta-elemene that has (1S,2S,4R)-configuration. It has a role as an antineoplastic agent."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=C][C@@H1][C][C][C@@][Branch1][N][C@@H1][Branch1][Ring2][C][Ring1][=Branch1][C][=Branch1][C][=C][C][Branch1][C][C][C][=C]"}]