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(2S,3R,10S,10aS,11S,12S,12aS,13S,13aR,14aS,14bS,15S,16R,18R,18aR,18bR)-3-(acetyloxy)-12a,13-dihydroxy-13a-(hydroxymethyl)-10,11,18-trimethyl-16-(1-methylethenyl)icosahydro-3H-2,15:2,16-diepoxybenzo[7,8]oxireno[5,6]azuleno[8,1-bc]oxacyclotridecin-12-yl ben