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(3R,4As,7R,8R,8aS)-8'-[(3S,4aR,7S,8S,8aR)-3,4',6'-trihydroxy-4,4,7,8a-tetramethylspiro[2,3,4a,5,6,7-hexahydro-1H-naphthalene-8,2'-3,7-dihydrofuro[3,2-g]isoindole]-8'-yl]-3,4'-dihydroxy-4,4,7,8a-tetramethylspiro[2,3,4a,5,6,7-hexahydro-1H-naphthalene-8,2'-3


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