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(3aR,9aR,9bS)-2,2,8,8-tetramethyl-9a,9b-dihydro-6H-[1,3]dioxolo[4',5':5,6]benzo[1,2-d][1,3]dioxin-4(3aH)-one
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(3aS,9aS,9bS)-2,2,8,8-tetramethyl-3a,4,9a,9b-tetrahydro-6H-[1,3]dioxolo[4',5':5,6]benzo[1,2-d][1,3]dioxin-4-ol
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(3aR,9aS,9bS)-2,2,8,8-tetramethyl-9a,9b-dihydro-6H-[1,3]dioxolo[4',5':5,6]benzo[1,2-d][1,3]dioxin-4(3aH)-one
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