[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an Alkylating Drug. The mechanism of action of estramustine is as an Alkylating Activity."}, {"from": "gpt", "value": "[C][C@][C][C][C@H1][C@H1][Branch1][#Branch2][C@@H1][Ring1][=Branch1][C][C][C@@H1][Ring1][=Branch2][O][C][C][C][=C][Ring1][O][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][=Branch1][C][=O][N][Branch1][Ring2][C][C][Cl][C][C][Cl]"}]