[(1R,2S,3S,7S,9R,12R,13S,15R,17S)-3,15-diacetyloxy-17-(acetyloxymethyl)-2,6-dimethyl-14-methylidene-4,11,16-trioxo-10-oxatetracyclo[7.7.1.02,7.013,17]heptadec-5-en-12-yl] (E)-undec-2-enoate 生成
11,20-Epoxy-1,11,12-trihydroxy-15-(2-undecenoyl)oxypicras-3,13(21)-diene-2,16-dione