[6-[2-[5,7-Dihydroxy-2-(4-hydroxy-3-methoxyphenyl)chromenylium-3-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]oxy-3,4,5-trihydroxyoxan-2-yl]methyl 3-(3,4-dihydroxyphenyl)prop-2-enoate