1-Nitro-6-azabenzo(a)pyrene N-oxide 1-Nitro-6-azabenzo(a)pyrene-N-oxide 1-Nitronaphth(2,1,8-mna)acridine 6-oxide 138835-33-3 CCRIS 5258 Naphth(2,1,8-mna)acridine, 1-nitro-, 6-oxide