1H-Imidazol-1-yloxy, 2-[4-[10-[4-(dimethylamino)phenyl]-9-anthracenyl]phenyl]-4,5-dihydro-4, 4,5,5-tetramethyl-, compd. with 2,3,5,6-tetrafluoro-2,5-cyclohexadiene-1,4-dione (1:1)