70993-77-0 HANNOAENONE NSC267709 Picras-3-ene-2,16-dione, 15-(acetyloxy)-11,20-epoxy-1,11,12-trihydroxy-6-[(2-methyl-1-oxo-2-butenyl)oxy]-, [1.beta.,6.alpha.(E),11.beta.,12.alpha.,15.beta.]- UNDULATONE