Synonyms: Naphtho[1,2-d]thiazolium,2-(2-ethoxy-1-butenyl)-1-(3-sulfopropyl)-, hydroxide, inner salt (8CI);Naphtho[1,2-d]thiazolium, 2-(2-ethoxy-1-butenyl)-1-(3-sulfopropyl)-, inner salt(9CI); 2-(2-Ethoxy-1-butenyl)-1-(3-sulfopropyl)naphtho[1,2-d]thiazoliumhydroxide inner salt