橙劑
2,4-D is one of the ingredients in Agent Orange, an herbicide that was widely used during the Malayan Emergency and the Vietnam War. However, 2,3,7,8-Tetrachlorodibenzodioxin (TCDD), a contaminant in the production of another ingredient in Agent Orange, 2,4,5-T, was the cause of the adverse health effects associated with Agent Orange.