1 MNX 1,8-di-hydroxy-4-nitro-xanthen-9-one 1.000 2 HNA 1,8-di-hydroxy-4-nitro-anthraquinone 0.864 3 EKU 1,3,5,8-tetrakis(oxidanyl)xanthen-9-one 0.773 4 CHZ 1,8-dihydroxyanthracene-9,10-dione 0.727 5 04G 7-hydroxy-3h-phenoxazin-3-one 0.714 6 JJY 3,4,6,7-tetrahydroacridine-1,8(2h,5h)-dione 0.714