9-acetyl-6,9-dihydroxy-8,10-dihydro-7H-tetracene-5,12-dione

(+/-)-9-<1,1-(ethylenedioxy)ethyl>-6,9-dihydroxy-7,8,9,10-tetrahydronaphthacene-5,12-dione

7',8'-dihydrospiro[[1,3]dioxolane-2,6'-isochromene]-1',3'(4'H,5'H)-dione

2,2-(ethylenedioxy)-5-hydroxy-7-methoxy-1,2,3,4-tetrahydro-6,11-naphthacenedione

(+/-)-6-ethynyl-6-hydroxy-5,6,7,8-tetrahydrohomophthalic anhydride