PICRAS-3-EN-21-OIC ACID 3,3-((1,5-DIOXO-1,5-PENTENEDIYL)BIS(OXY))BIS(13,20-EPOXY-11,12-DIHYDROXY-15-((3-METHYL-1-OXO-2-BUTENYL)OXY)-2,16-DIOXO-,DIMETHYL ESTER,(11SS,12A,15SS)-(11SS,12A,15SS)-
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