NSC81055 Pyridinium, 1-(5,8-dihydro-7(or 6)-hydroxy-5,8-dioxo-6(or 7)-quinolyl)hydroxide, inner salt Pyridinium, 1-[5,8-dihydro-7(or 6)hydroxy-5,8-dioxo-6(or 7)-quinolinyl]-, hydroxide, inner salt