Showing structure for 6-{[6-({[3,4-dihydroxy-2,5-bis(hydroxymethyl)oxolan-2-yl]oxy}methyl)-3,4,5-trihydroxyoxan-2-yl]oxy}-5-ethenyl-4a-hydroxy-3h,4h,5h,6h-pyrano[3,4-c]pyran-1-one