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4-Hydroxy-3-nitrobenzaldehyde reacts with 3-bromobenzohydrazide in methanol to yield (E)-3-bromo-N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide.
H 1022 (OTTO) 4-Hydroxy-3-nitrobenzaldehyde, 97% Cas 3011-34-5 - used in chemical research.