Diquat dichloride ,its CAS NO. is 4032-26-2,the synonyms is 1,1'-Ethylene-2,2'-dipyridinium dichloride ; Diquat dichloride monohydrate ; Diquat hydrochloride ; Dipyrido(1,2-a;2',1'-c)pyrazinediium, 6,7-dihydro-,dichloride .