[′dī·nə‚tərb ′as·ə‚tāt] (organic chemistry) C12H14N2O6 A yellow, crystalline compound with a melting point of 133-134°C; used as a preemergence herbicide for sugarbeets, legumes, and cereals, and as a postemergence herbicide for maize, sorghum, and alfalfa.