Synonyms: 2-[2-[(3-Ethyl-5,6-dimethyl-2-benzothiazolinylidene)methyl]-1-butenyl]-3-(2-hydroxy-3-sulfopropyl)-5-methylbenzothiazoliumhydroxide, inner salt (7CI); Benzothiazolium,3-ethyl-2-[2-[[3-(2-hydroxy-3-sulfopropyl)-5-methyl-2(3H)-benzothiazolylidene]methyl]-1-butenyl]-5,6-dimethyl-,hydroxide, inner salt; Benzothiazolium,3-ethyl-2-[2-[[3-(2-hydroxy-3-sulfopropyl)-5-methyl-2(3H)-benzothiazolylidene]methyl]-1-butenyl]-5,6-dimethyl-,inner salt (9CI)