aflatoxin aflatoxin B1 (6aR,9aS)-4-methoxy-2,3,6a,9a-tetrahydrocyclopenta[c]furo[3',2':4,5]furo[2,3-h]chromene-1,11-dione An aflatoxin having a tetrahydrocyclopenta[c]furo[3',2':4,5]furo[2,3-h]chromene skeleton with oxygen functionality at positions 1, 4 and 11. C17H12O6 CAS:1162-65-8 [H][C@]12OC=C[C@@]1([H])c1c(O2)cc(OC)c2c3CCC(=O)c3c(=O)oc12