Showing structure for (3r)-3-(3,5-dihydroxy-4-methoxyphenyl)-3-[(3r)-3-(3,5-dihydroxy-4-methoxyphenyl)-5-hydroxy-8,8-dimethyl-4-oxo-2h-pyrano[2,3-f]chromen-3-yl]-5-hydroxy-8,8-dimethyl-2h-pyrano[2,3-f]chromen-4-one