[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][=Branch1][C][=O][C@][Branch2][Ring2][Branch1][C@@H1][Branch2][Ring1][S][C][C@@H1][C@@][Ring1][Branch1][Branch2][Ring1][#Branch1][C][C][C@H1][C@H1][Ring1][=Branch1][C][C][C][=C][C][=Branch1][C][=O][C][C][C@][Ring1][O][Ring1][#Branch1][C][C][O][O]"}, {"from": "gpt", "value": "The molecule is a C21-steroid that is pregn-4-ene substituted by oxo groups at position 3 and 20 and hydroxy groups at positions 16 and 17. It has a role as a progestin. It is a 20-oxo steroid, a 16alpha-hydroxy steroid, a 17-hydroxy steroid, a C21-steroid, a 3-oxo-Delta(4) steroid and a tertiary alpha-hydroxy ketone. It derives from a hydride of a pregnane."}]