Showing structure for 5-[4-(acetyloxy)-7,10-dihydroxy-9-methoxy-3-methyl-1h,3h,4h-naphtho[2,3-c]pyran-6-yl]-10-hydroxy-7,9-dimethoxy-3-methyl-1h,3h,4h-naphtho[2,3-c]pyran-4-yl acetate