(1beta,11beta,12alpha,15beta)-11,20-Epoxy-1,11,12-trihydroxy-15-(2-methyl-1-oxobutoxy)picras-3-ene-2,16-dione 53683-73-1 Picras-3-ene-2,16-dione, 11,20-epoxy-1,11,12-trihydroxy-15-(2-methyl-1-oxobutoxy)-, (1beta,11beta,12alpha,15beta)-