Showing structure for methyl (3s,4r,4ar)-7-{[(5s,6s,10ar)-5,9-dihydroxy-10a-(methoxycarbonyl)-6-methyl-8-oxo-6,7-dihydro-5h-xanthen-1-yl]oxy}-4,8,9-trihydroxy-3-methyl-1-oxo-3,4-dihydro-2h-xanthene-4a-carboxylate