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(2S,3As,4aS,4'S,6S,8aR,9R,10R)-3a-(2-Hydroxypropan-2-yl)-1,8a-dimethyl-2'-oxo-3,3a,4,4a,6,7,8,8a,9,10-decahydro-2H-spiro[benzo[f]azulene-5,4'-[1,3]dioxolane]-2,6,9,10-tetrayl tetraacetate


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