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(3Ar,4R,5R,5aS,9aS,9bS)-5-hydroxy-4,5a,9,9-tetramethyl-5-[2-(5-oxo-2H-furan-3-yl)ethyl]-4,6,7,8,9a,9b-hexahydro-3aH-naphtho[1,2-d][1,3]dioxol-2-one


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