Synonyms: Carbazine 720;CCRIS 4970;2',3',5',6'-tetramethyl-4',7-dioxo-7h-spiro[acridine-9,1'-cyclohexa[2,5]dien]-2-olate;AC1Q6A1Z;AC1L3506;EINECS 262-066-9;AR-1D2129;1',2',4',5'-tetramethyl-6',7-dioxospiro[acridine-9,3'-cyclohexa-1,4-diene]-2-olate;Spiro(acridine-9(2H),1'-(2,5)cyclohexadiene)-2,4'-dione, 7-hydroxy-2',3',5',6'-tetramethyl-, ion(1-)