[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a 17beta-hydroxy steroid and a terminal acetylenic compound. It has a role as an anti-estrogen, an estrogen antagonist and a geroprotector. It derives from a hydride of a pregnane."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][C@H1][Branch1][=C][C@@H1][Ring1][=Branch1][C][C][C@][Ring1][=Branch2][Branch1][Ring1][C][#C][O][C][C][C][=C][C][=C][Branch1][Branch2][C][C@][Ring1][P][Ring1][=Branch1][C][C][=N][O][Ring1][Branch2]"}]