[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a steroid. It has a role as an estrogen."}, {"from": "gpt", "value": "[C][C@][C][C][C][C@H1][C][C][C][=Branch1][C][=O][C][=C][Ring1][#Branch1][C][C][C][Ring1][O][C][Ring1][#C][C][C][C@][Ring2][Ring1][C][Branch1][Ring1][C][#C][O]"}]