Showing structure for (3s,4s)-5-[(3s,4s)-4,10-dihydroxy-7,9-dimethoxy-3-methyl-1h,3h,4h-naphtho[2,3-c]pyran-5-yl]-7,9-dimethoxy-3-methyl-1h,3h,4h-naphtho[2,3-c]pyran-4,10-diol