Synonyms: 1-Ethyl-2-[(1-ethyl-2(1H)-quinolylidene)methyl]quinoliniumiodide (6CI); 1-Ethyl-2-[(1-ethyl-4(1H)-quinolylidene)methyl]quinolinium iodide(7CI); Quinolinium, 1-ethyl-2-[(1-ethyl-2(1H)-quinolinylidene)methyl]-, iodide(9CI); Quinolinium, 1-ethyl-2-[(1-ethyl-2(1H)-quinolylidene)methyl]-, iodide(8CI); 1,1'-Diethyl-2,2'-cyanine iodide; 1,1'-Diethyl-2,2'-diquinocyanineiodide; 1,1'-Diethyl-2,2'-quinocyanine iodide; 2,2'-Quinocyanine iodide;Decynium 22; Diethylcyanine iodide; Eastman 7851; N,N'-Diethylpseudoisocyanineiodide; PICI; Pseudoisocyanin; Pseudoisocyanine; Pseudoisocyanine iodide;pseudo-Isocyanine iodide