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?? ???? >(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid
(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid
(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid ??
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(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid C??? ??, ??, ??
(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid ?? ?? ? ???
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(3S,3aβ,6aα)-Hexahydro-3β,6-dimethyl-2-oxo-2H-cyclopenta[b]furan-6β-carboxylic acid ?? ??
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