Aflatoxin b2; (6ar-cis)(2,3,6a,8,9,9a)hexahydro-4-methoxycyclopenta[c]furo[3',2':4,5]furo[2,3 methoxycyclopenta[c]furo[3',2':4,5]furo[2,3-h][2]benzopyran-1,11-dione; 2,3,6aalpha,8,9,9aalpha-hexahydro-4-methoxycyclopenta[c]furo[2',3':4,5]furo[2,3-h]chromene-1,11-dione; Cyclopenta[c]furo[3',2':4,5]furo[2,3-h][1]benzopyran-1,11-dione, 2,3,6a,8,9,9a-hexahydro-4-methoxy-, (6aR-cis).