2-Propen-1-one, 1-(3-((1S,5R,6S)-6-(2,4-dihydroxy-3-(3-methyl-2-butenyl)benzoyl)-5-(2,4-dihydroxyphenyl)-3-methyl-2-cyclohexen-1-yl)-2,4-dihydroxyphenyl)-3-(2,4-dihydroxyphenyl)-, (2E)- 81381-68-2