Synonyms: Benzothiazolium,2-[2-[[5,6-dimethoxy-3-(4-sulfobutyl)-2(3H)-benzothiazolylidene]methyl]-1-butenyl]-3-ethyl-5,6-dimethyl-,hydroxide, inner salt; Benzothiazolium,2-[2-[[5,6-dimethoxy-3-(4-sulfobutyl)-2(3H)-benzothiazolylidene]methyl]-1-butenyl]-3-ethyl-5,6-dimethyl-,inner salt (9CI)