N-tert-Butyl-3-(2-hydroxypropan-2-yl)-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide-d3 is the isotope labelled analog of N-tert-Butyl-3-(2-hydroxypropan-2-yl)-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide (B693040); a metabolite of Amicarbazone (A605040) which is a triazolinone herbicide with a broad spectrum of weed control.