2α,4β-Bis(4-hydroxy-3-methoxyphenyl)-1α,3β-cyclobutanedicarboxylic acid
2α,4β-Bis(4-hydroxy-3-methoxyphenyl)-1α,3β-cyclobutanedicarboxylic acid ??
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2α,4β-Bis(4-hydroxy-3-methoxyphenyl)-1α,3β-cyclobutanedicarboxylic acid C??? ??, ??, ??
2α,4β-Bis(4-hydroxy-3-methoxyphenyl)-1α,3β-cyclobutanedicarboxylic acid ?? ?? ? ???
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2α,4β-Bis(4-hydroxy-3-methoxyphenyl)-1α,3β-cyclobutanedicarboxylic acid ?? ??
???( 0)?? ??
