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(4aS,6R,7S,7aR,11aR,2'S,3a'R,6a'S)-7-(hexahydrofuro[2,3-b]furan-2'-yl)-3,3,6,7-tetramethyl-11-methyleneoctahydronaphtho[1,8a-d][1,3]dioxine
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(4aS,6R,7S,7aR,11R,2'S,3a'R,6a'S)-7-(hexahydrofuro[2,3-b]furan-2'-yl)-3,3,6,7-tetramethyloctahydro-11-vinylnaphtho[1,8a-d][1,3]dioxine
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