[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a member of pyrrolizines and a but-2-enoate ester."}, {"from": "gpt", "value": "[C][/C][=C][Branch1][C][/C][\\C][=Branch1][C][=O][O][C@@H1][C][C][N][C@@H1][Ring1][Branch1][C][=Branch1][Branch1][=C][C][Ring1][Branch1][C][O][C][=Branch1][C][=O][/C][=Branch1][Ring1][=C][\\C][/C][O]"}]