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4-Nitrophenol 2,6-DINITROPHENOL 4-Fluorophenol Sodium 4-nitrophenoxide NITROGEN DIOXIDE Fluorine PICRIC ACID 2-BROMO-4-FLUORO-5-NITROPHENOL 2-Chloro-4-fluoro-5-nitrophenol 4-Bromo-2-fluoro-6-nitrophenol