dimethyl 3,4,6,11-tetrahydro-2,5,12-trihydroxy-7-methoxy-6,11-dioxo-1,3-naphthacenedicarboxylate

11-acetoxy-2,2-ethylenedioxy-6-hydroxy-7-methoxy-1,2,3,4-tetrahydronaphthacene-5,12-dione

4,6-dimethoxy-9-(2,2-dimethyl trimethylene ketal)-11-(methoxy methyloxy)-7,8,9,10-tetrahydronaphthalene-5,12-dione

5'-ethoxy-7'-methoxy-12'-(methoxymethoxy)-5,5-dimethyl-3',4'-dihydro-1'H-spiro[[1,3]dioxane-2,2'-tetracene]-6',11'-dione

cis-9,10-dihydroxy-4,5,6,11,12-pentamethoxy-7,8,9,10-tetrahydronaphthacene