2-(4-Bromophenyl)-1-methyl-d3-5-nitro-1H-benzo[d]imidazole is the labeled analogue of 2-(4-Bromophenyl)-1-methyl-5-nitro-1H-benzo[d]imidazole (B689260), which has been used in the study of 5-nitrofuran derivatives as an inhibitor of nucleic acid and protein synthesis in Ehrlich ascites tumor cells.