304-81-4 N-Oxide de phenazine N-Oxyphenazine NSC21665 Phenazin Phenazin-5-oxide Phenazine 5-oxide Phenazine 9-oxide Phenazine N-oxide Phenazine mono-N-oxide Phenazine monooxide Phenazine, 5-oxide Phenazine, N-monoxide WLN: T C666 BN INJ BO