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(3S,4S,4As,6S,8S,11R,12R,12aR)-6-Hydroxy-9,12a,13,13-tetramethyl-2'-oxo-2,3,4a,5,6,7,8,11,12,12a-decahydro-1H-spiro[6,10-methanobenzo[10]annulene-4,4'-[1,3]dioxolane]-3,8,11,12-tetrayl tetraacetate


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