[{"from": "human", "value": "Please give me some details about this molecule. [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][C][=Branch1][C][=O][C][C][C@H1][Ring1][S][Ring1][#Branch1]"}, {"from": "gpt", "value": "The molecule is a synthetic, anabolic steroid analog of testosterone. Similar to testosterone, nortestosterone (19-Nortestosterone) binds to and activates specific nuclear receptors.  This agent may be used for testosterone replacement therapy in hypogonadal men, in HIV-wasting syndrome, and in other conditions in order to increase nitrogen retention and fat-free muscle mass."}]