[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=O][C@H1][C][C][C@@H1][C@@][Ring1][Branch1][Branch2][Ring1][=Branch2][C][=C][C@H1][C@H1][Ring1][=Branch1][C][C][C@H1][C@@][Ring1][=Branch1][Branch1][#Branch2][C][C][C][=Branch1][C][=O][C][Ring1][#Branch1][C][C]"}, {"from": "gpt", "value": "The molecule is a C21-steroid that is 5beta-pregn-11-ene substituted by oxo groups at positions 3 and 20. It is a 20-oxo steroid, a C21-steroid and a 3-oxo-5beta-steroid. It derives from a hydride of a pregnane."}]