Synonyms: 1H-Benz[e]indolium,2-[7-[1,3-dihydro-1,1-dimethyl-3-(4-sulfobutyl)-2H-benz[e]indol-2-ylidene]-1,3,5-heptatrienyl]-1,1-dimethyl-3-(4-sulfobutyl)-,iodide, monosodium salt (9CI); 3,3,3',3'-Tetramethyl-1,1'-di(4-sulfobutyl)-4,5;4',5'-dibenzoindotricarbocyanineiodide, monosodium salt; IR 125; IR 125 iodide