[{"from": "human", "value": "Provide a description of this molecule. [C][C@H1][C@@H1][C][C][C][=C][Branch1][=N][C@][Ring1][=Branch1][Branch1][#Branch1][C][C][C][Ring1][#Branch2][=O][C][C][C][C@][Branch2][Ring1][Branch1][C@H1][Ring1][N][C][C][C@@H1][Ring1][Branch1][C@H1][Branch1][C][C][C][C][C][=C][Branch1][C][C][C][C]"}, {"from": "gpt", "value": "The molecule is a 3-dehydro-4-methylzymosterol in which the methyl substituent at position 4 has alpha configuration. It is an intermediate in the biosynthesis of cholesterol."}]