Showing structure for [(1r,3s)-8-[(4r,5s,6r)-4-(dimethylamino)-5-hydroxy-6-methyloxan-2-yl]-5,10-dihydroxy-1-methyl-6,9-dioxo-1h,3h,4h-naphtho[2,3-c]pyran-3-yl]acetic acid