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Ethyl (E)-4-[(3aS,4S,5R,5aS,9aS,9bS)-4-(1-ethoxyethoxy)-4,5a,9,9-tetramethyl-2-oxo-5,6,7,8,9a,9b-hexahydro-3aH-naphtho[1,2-d][1,3]dioxol-5-yl]-2-methylbut-2-enoate


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