81612-60-4 Methyl (11beta,12alpha,15beta)-12-(acetyloxy)-13,20-epoxy-11-hydroxy-3,15-bis((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxopicras-3-en-21-oate Methyl 12-(acetyloxy)-13,20-epoxy-11-hydroxy-3,15-bis((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxopicras-3-en-21-oate (11beta,12alpha,15beta)- Picras-3-en-21-oic acid, 12-(acetyloxy)-13,20-epoxy-11-hydroxy-3,15-bis((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxo-, methyl ester, (11beta,12alpha,15beta)-