3,14'-Bihispidinyl;3-[4,5-Dihydroxy-2-[(E)-2-(4-hydroxy-2-oxo-2H-pyran-6-yl)ethenyl]phenyl]-6-[(E)-2-(3,4-dihydroxyphenyl)ethenyl]-4-hydroxy-2H-pyran-2-one
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