Showing structure for (2s,3r)-2-(3,4-dihydroxyphenyl)-3-[(2s,3r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-4-oxo-2,3-dihydro-1-benzopyran-3-yl]-7-hydroxy-2,3-dihydro-1-benzopyran-4-one