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?? ???? >3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester
3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester
3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester ??
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3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester C??? ??, ??, ??
3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester ?? ?? ? ???
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3α,4α-(Isopropylidenedioxy)tetrahydrofuran-2β,5β-dicarboxylic acid dimethyl ester ?? ??
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