[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch2][Ring2][C][C@H1][C][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]"}, {"from": "gpt", "value": "The molecule is a C21-steroid that is pregnane which contains a double bond between positions 4 and 5 and is substituted by an oxo group at position 3 and a hydroxy group at position 20. It is a C21-steroid, a 3-oxo-Delta(4) steroid and a 20-hydroxy steroid. It derives from a hydride of a pregnane."}]