60120-71-0 7-Hydroxy-2',3',5',6'-tetramethylspiro(acridine-9(2H),1'-(2,5)cyclohexadiene)-2,4'-dione 84013-94-5 CCRIS 4970 Carbazine 720 EINECS 262-066-9 Spiro(acridine-9(2H),1'-(2,5)cyclohexadiene)-2,4'-dione, 7-hydroxy-2',3',5',6'-tetramethyl-, ion(1-)