[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][C][=C][C][=C][Branch1][=Branch2][C@@H1][Branch1][Branch1][C][C][Ring1][Branch1][O][C][=Branch1][C][=O][O][C][Ring1][O][=C][C@@H1][C][=C][O][C@H1][Ring1][Branch1][O][C][Ring1][Branch2][=C][Ring2][Ring1][Branch1]"}, {"from": "gpt", "value": "The molecule is a metabolite of aflatoxin B1, one of the mycotoxins from Aspergillus flavus and A. parasiticus. Aflatoxins are toxic and probably among the most carcinogenic substances known. They are common and widespread in nature and can colonize and contaminate grain before harvest or during storage. (L1956)"}]