Showing structure for (2s,3s)-5,6,8-trihydroxy-2,3-dimethyl-9-[(2s,3s)-5,6,8-trihydroxy-2,3-dimethyl-4-oxo-2h,3h-naphtho[2,3-b]pyran-9-yl]-2h,3h-naphtho[2,3-b]pyran-4-one