59866-89-6 B628279K047 NSC283453 PIERREODENDRONKERSTINGII B628279K047 Picras-3-ene-2,16-dione, 15-(benzoyloxy)-11,20-epoxy-1,11,12-trihydroxy- Picras-3-ene-2,16-dione, 15-(benzoyloxy)-11,20-epoxy-1,11,12-trihydroxy-, (1.beta.,11.beta.,12.alpha.,15.beta.)-