Showing structure for (2r,3r)-2-(3,4-dihydroxyphenyl)-6-[(2r,3s)-2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxo-2,3-dihydro-1-benzopyran-3-yl]-3,5,7-trihydroxy-2,3-dihydro-1-benzopyran-4-one