Indigotrisulfonate potassium salt

3,3'-dioxo-?2,2'-biindolinetrisulfonic acid tripotassium salt ; 1h-indoledisulfonicacid, 2-(1,3-dihydro-3-oxosulfo-2h-indol-2-ylidene)-2,3-dihydro-3-oxo-,potassium salt (1:3) ; tri-potassium indigotrisulfonate, tripotassium indigotrisulfonate ; tripotassium 3,3'-dioxo-[delta2,2'-biindoline]trisulphonate ; indigo trisulfonate potassium salt redox indicator ; [d2,2'-biindoline]trisulfonic acid, 3,3'-dioxo-, tripotassium salt (7ci,8ci) ; tri-potassium indigotrisulfonate ; 1h-indolesulfonicacid, 2-(1,3-dihydro-3-oxo-2h-indol-2-ylidene)-2,3-dihydro-3-oxo-, disulfoderiv., tripotassium salt (9ci) ; indigotrisulfonic acid tripotassium salt ; indigotrisulfonate tripotassium salt