Synonyms: 3-(2-Carboxyethyl)-2-[3-[3-(2-carboxyethyl)-2-benzothiazolinylidene]-2-methylpropenyl]benzothiazoliumhydroxide, inner salt (7CI); Benzothiazolium,3-(2-carboxyethyl)-2-[3-[3-(2-carboxyethyl)-2(3H)-benzothiazolylidene]-2-methyl-1-propenyl]-,hydroxide, inner salt; Benzothiazolium, 3-(2-carboxyethyl)-2-[3-[3-(2-carboxyethyl)-2(3H)-benzothiazolylidene]-2-methyl-1-propenyl]-,inner salt (9CI); Benzothiazolium,3-(2-carboxyethyl)-2-[3-[3-(2-carboxyethyl)-2-benzothiazolinylidene]-2-methylpropenyl]-,hydroxide, inner salt (8CI); Thiacarbocyanine hydroxide,anhydro-3,3'-dicarboxyethyl-9-methyl- (8CI);3,3'-Dicarboxyethyl-9-methylthiacarbocyanine zwitter ion