Synonyms: 1,1'-Dimethyl-4,4'-bipyridinium;1,1'-Dimethyl-4,4'-bipyridinium cation;Dimethyl viologen;Methyl viologendication;Methyl viologen ion(2+);Methyl viologen(2+);N,N'-Dimethyl-4,4'-bipyridinium;N,N'-Dimethyl-4,4'-bipyridinium dication;Paraquat dication;Paraquat ion;Spraytop-graze;Starfire;Paraquat dichloride;