70993-79-2 DESACETYLUNDULATONE NSC367543 Picras-3-ene-2,16-dione, 11,20-epoxy-1,11,12,15-tetrahydroxy-6-[(2-methyl-1-oxo-2-butenyl)oxy]-, [1.beta.,6.alpha.(E),11.beta.,12.alpha.,15.beta.]-