Synonyms: 3-Ethyl-2-[3-(3-ethyl-2-benzothiazolinylidene)-2-methylpropenyl]benzothiazoliumiodide (6CI,7CI); Benzothiazolium,3-ethyl-2-[3-(3-ethyl-2(3H)-benzothiazolylidene)-2-methyl-1-propenyl]-, iodide(9CI); Benzothiazolium,3-ethyl-2-[3-(3-ethyl-2-benzothiazolinylidene)-2-methylpropenyl]-, iodide(8CI); Thiacarbocyanine iodide, 3,3'-diethyl-9-methyl- (8CI);3,3'-Diethyl-9-methyl-2,2'-thiacarbocyanine iodide;3,3'-Diethyl-9-methylthiacarbocyanine iodide; Bis(3-ethyl-2-benzothiazole)-b-methyltrimethinecyanine iodide;NK 77; ST 656