Synonyms: 1-Ethyl-2-[5-(1-ethyl-2(1H)-quinolylidene)-1,3-pentadienyl]quinoliniumiodide (6CI,7CI); Quinolinium,1-ethyl-2-[5-(1-ethyl-2(1H)-quinolinylidene)-1,3-pentadienyl]-, iodide (9CI);Quinolinium, 1-ethyl-2-[5-(1-ethyl-2(1H)-quinolylidene)-1,3-pentadienyl]-,iodide (8CI); 1,1'-Diethyl-2,2'-dicarbocyanine iodide; 1,1'-Diethyl-2,2'-quinodicarbocyanineiodide; 1,1'-Diethyldicarbocyanine iodide; 2,2'-Dicarbocyanine iodide,1,1'-diethyl-; DDCI dye; DDI; DDI (dye); Diethyldicarbocyanine iodide; Eastman9618; NK 1456