Showing structure for methyl 5-ethenyl-4-{3-[3-ethenyl-5-(methoxycarbonyl)-2-{[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-3,4-dihydro-2h-pyran-4-yl]-4-oxobut-2-en-1-yl}-6-{[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}-5,6-dihydro-4h-pyran-3-carboxylate