Agent orange contains the Tetrachlorodibenzo-para-dioxin, or TCDD 2,3,7.8 on account of its molecular composition. The dioxins are made of 2 benzene nuclei, 2 chlorine, fluorine or bromine molecules (4 for the most toxic variety).The TCDD dioxin is the strongest known poison - one million times more toxic than the most harmful natural poison. VietnamAnswer again soon!