Showing structure for 3,7-dihydroxy-1,8,8,9-tetramethyl-5-({3,4,7-trihydroxy-1,8,8,9-tetramethyl-6-oxo-9h-phenaleno[1,2-b]furan-5-yl}imino)-9h-phenaleno[1,2-b]furan-4,6-dione