1-Acetoxy-6-.alpha.-senecioyloxychaparrinone 68499-53-6 NSC295151 Picras-3-ene-2,16-dione, 1-(acetyloxy)-11,20-epoxy-11,12-dihydroxy-6-[(3-methyl-1-oxo-2-butenyl)oxy]- SENECIOYLOXYCHAPARRINONE, 6A,1-ACETOXY