2-NP-AOZ-d4 is a deuterium labeled 2-NP-AOZ. 2-NP-AOZ is a 2-nitrophenyl derivative of AOZ (a tissue-bound metabolite of the Furazolidone). 2-NP-AOZ can be used to determination of the AOZ residues[1][2].
References:
[1]. Cheng CC, et, al. Development and residue screening of the furazolidone metabolite, 3-amino-2-oxazolidinone (AOZ), in cultured fish by an enzyme-linked immunosorbent assay. J Agric Food Chem. 2009 Jul 8;57(13):5687-92.
[2]. Li Z, et, al. Simultaneous detection of four nitrofuran metabolites in honey by using a visualized microarray screen assay. Food Chem. 2017 Apr 15;221:1813-1821.