Cypripediquinone A, a new phenanthraquinone from Cypripedium macranthum (Orchidaceae)

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A new phenanthraquinone, cypripediquinone A, was isolated from the rhizome of Cypripedium macranthum ( Orchidaceae ) and its structure was established as 2,4,7-trimethoxy-9, 10- phenanthraquinone mainly by spectroscopic analysis.
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