[{"from": "human", "value": "Describe this molecule. [C][C][C][C][C][C@@H1][Branch2][Ring1][=N][/C][=C][/C@H1][C@@H1][Branch2][Ring1][Branch1][C][C@@H1][Branch1][S][C@@H1][Ring1][Branch1][C][C][=Branch1][C][=O][C][C][C][=Branch1][C][=O][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is a beta-oxidation product of 6-keto prostaglandin F1 alpha (PGF1a) and the major urinary metabolite of prostaglandin I2 (prostacyclin, PGI2). 2,3-dinor-6-ketoprostaglandin F1alpha in urine is often used as a correlative marker to indirectly measure prostacyclin production."}]