The dipyridylium herbicides, paraquat and diquat.
D000383:Agriculture; D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D002736:Chloroplasts / Q000187:drug effects; D005609:Free Radicals; D006540:Herbicides; D006801:Humans; D008892:Milk / Q000032:analysis; D010788:Photosynthesis; D010944:Plants / Q000378:metabolism; D011726:Pyridinium Compounds / Q000032:analysis / Q000378:metabolism / Q000494:pharmacology / Q000633:toxicity; D013501:Surface-Active Agents; D014867:Water / Q000032:analysis; D014887:Weather
D005609:Free Radicals; D006540:Herbicides; D011726:Pyridinium Compounds; D013501:Surface-Active Agents; D014867:Water