[{"from": "human", "value": "Provide a description of this molecule. [C][C@][C][C][C][=C][Branch1][#Branch2][C@@H1][Ring1][=Branch1][C][C][C][Ring1][=Branch2][=O][C][=C][C][=C][Ring1][O][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O]"}, {"from": "gpt", "value": "The molecule is an estrogenic steroid produced by horses. It has a total of five double bonds in the A- and B-ring. High concentration of equilenin is found in the urine of pregnant mares."}]