4-bromo-9,10-dioxo-9,10-dihydroanthracen-1-olate 9,10-anthracenedionato, 1-bromo-4-hydroxy-, ion(1-) InChI=1/C14H7BrO3/c15-9-5-6-10(16)12-11(9)13(17)7-3-1-2-4-8(7)14(12)18/h1-6,16H/p-