3-Hydroxy-2-hydroxyamino-6-nitro-benzonitril;6-Nitro-2-hydroxylamino-3-oxy-benzonitril;4-Nitro-2-hydroxylamino-3-cyan-phenol;Purpursaeure aus 2.4-Dinitro-phenol;Metapurpursaeure;2-Hydroxylamino-3-oxy-6-nitro-benzonitril;3-hydroxy-2-(hydroxyamino)-6-nitrobenzonitrile