Showing structure for methyl 2-[(1r,3r,4r)-6-[(4r,6r)-4-(dimethylamino)-5-hydroxy-6-methyloxan-2-yl]-4,9-dihydroxy-1-methyl-5,10-dioxo-1h,3h,4h-naphtho[2,3-c]pyran-3-yl]acetate