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    2,2,3,3-tetramethoxy-4H-pyran
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    2,2,3,3-tetramethoxycyclobutane-1-carbaldehyde
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    methyl 3-hydroxy-2,2-dimethoxy-3-phenylpropanoate
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    1-chloro-1,2,2,3,3-pentamethoxycyclopropane
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    2,2,3,3-tetramethoxycyclobutane-1-carbonitrile
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