Showing structure for methyl 2-{6-[9,10-dihydroxy-7-methoxy-3-(2-methoxy-2-oxoethyl)-1-oxo-3h,4h-naphtho[2,3-c]pyran-6-yl]-9,10-dihydroxy-7-methoxy-1-oxo-3h,4h-naphtho[2,3-c]pyran-3-yl}acetate