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2,4-di·ni·tro·phe·nol (DNP, Dnp),(dī-nī'trō-fē'nol),
N2pH-OH; a toxic dye, chemically related to trinitrophenol (picric acid), used in biochemical studies of oxidative processes where it uncouples oxidative phosphorylation; it is also a metabolic stimulant.
1 a dye used in biochemical research into oxidative processes.
2 a hapten commonly used to induce immune response.
C6H4N2O5; a toxic compound formerly used to make dyes.