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1,5-Methano-2H,8H-oxireno[1,8]cycloocta[1,2-f][2]benzopyran-4-aceticacid, 8-(3-furanyl)dodecahydro-a,1-dihydroxy-3,3,5,7a-tetramethyl-2-[(2-methyl-1-oxo-2-butenyl)oxy]-10,13-dioxo-,methyl ester, (1S,2S,4S,5S,5aR,7aR,8R,11aR,11bS,12aS)- (9CI)