Synonyms: 3-Ethyl-2-[2-[(3-ethyl-2-benzothiazolinylidene)methyl]-1-butenyl]benzothiazoliumiodide (7CI); Benzothiazolium,3-ethyl-2-[2-[(3-ethyl-2(3H)-benzothiazolylidene)methyl]-1-butenyl]-, iodide(9CI); Benzothiazolium,3-ethyl-2-[2-[(3-ethyl-2-benzothiazolinylidene)methyl]-1-butenyl]-, iodide(8CI); Thiacarbocyanine iodide, 3,3',9-triethyl- (8CI);3,3',9-Triethyl-2,2'-thiacarbocyanine iodide;3,3'-Diethyl-9-ethylthiacarbocyanine iodide; NK 737