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(1Ar,10aalpha)-1,1,7,9alpha-Tetramethyl-4alpha-(triethylsiloxy)-5beta,7beta-dihydroxy-2beta,8aalpha-methano-5abeta,6beta-(epoxymethanoxy)tetradecahydrocyclopenta[a]cyclopropa[e]cyclodecene-11,13-dione


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