Showing structure for 6-[(4a-{[9,10a-dihydroxy-3-(2-methoxy-2-oxoethyl)-1-methyl-5,10-dioxo-1h,3h,4h-naphtho[2,3-c]pyran-4a-yl]sulfanyl}-9,10a-dihydroxy-3-(2-methoxy-2-oxoethyl)-1-methyl-5,10-dioxo-1h,3h,4h-naphtho[2,3-c]pyran-8-yl)oxy]-3,4,5-trihydroxyoxane-2-carboxylic acid