[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][C][C][C][C][C][Ring1][Branch1][Branch2][Ring1][=Branch1][C][C][C][C][Ring1][=Branch1][C][C][C][C][Ring1][=Branch1][Branch1][#Branch1][C][C][C][C][Ring1][=Branch1][C][C]"}, {"from": "gpt", "value": "The molecule is a steroid that has a structure based on a 21-carbon (pregnane) skeleton. Note that individual examples may have ring substituents at other positions and/or contain double bonds, aromatic A-rings, expanded/contracted rings etc., so the formula and mass may vary from that given for the generic structure."}]