1,2-Dihydro-5-(1-hydroxy-1-methylethyl)-3H-1,2,4-triazol-3-one is an intermediate in synthesizing N-tert-Butyl-3-(2-hydroxypropan-2-yl)-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide (B693040), which is a metabolite of Amicarbazone (A605040); a triazolinone herbicide with a broad spectrum of weed control.