Showing structure for 6-({4-ethenyl-4a-hydroxy-8-oxo-3h,4h,5h,6h-pyrano[3,4-c]pyran-3-yl}oxy)-18-ethylidene-4,5-dihydroxy-2,7,10,14,19-pentaoxatetracyclo[9.7.1.0³,⁸.0¹²,¹⁷]nonadec-12(17)-en-13-one