Paraquat and glyphosate are widely used herbicides. Other predominant toxin-based models employ the insecticide rotenone, the herbicide paraquat and the fungicide maneb. Other predominant toxin-based models employ the insecticide rotenone, the herbicide paraquat, and the fungicide maneb. As an herbicide, paraquat acts by inhibiting photosynthesis. Some workers suffered severe injuries from exposure to herbicides containing paraquat. The widely used herbicide paraquat is a viologen. She committed suicide using the herbicide paraquat in 2007. In 1962, ICI developed the controversial herbicide, paraquat. The viologen paraquat (R = methyl), is a widely used herbicide. The herbicide paraquat is suspected to be one such factor. From a commercial perspective, an important pyridinium compound is the herbicide paraquat. Accidental deaths and suicides from paraquat ingestion are relatively common. The main use of pyridine is as a precursor to the herbicides paraquat and diquat. There have been some successful cases of using cyclophosphamide to treat paraquat poisoning. To secure approval, ChemChina agreed to divest from pesticide production of paraquat, abamectin, and chlorothalonil.