Synonyms: 1-(3-Sulfopropyl)-2-[2-[[1-(3-sulfopropyl)naphtho[1,2-d]thiazolin-2-ylidene]methyl]-1-butenyl]naphtho[1,2-d]thiazoliumhydroxide, inner salt (7CI); Naphtho[1,2-d]thiazolium,1-(3-sulfopropyl)-2-[2-[[1-(3-sulfopropyl)naphtho[1,2-d]thiazol-2(1H)-ylidene]methyl]-1-butenyl]-,hydroxide, inner salt; Naphtho[1,2-d]thiazolium,1-(3-sulfopropyl)-2-[2-[[1-(3-sulfopropyl)naphtho[1,2-d]thiazol-2(1H)-ylidene]methyl]-1-butenyl]-,inner salt (9CI); Naphtho[1,2-d]thiazolium,1-(3-sulfopropyl)-2-[2-[[1-(3-sulfopropyl)naphtho[1,2-d]thiazolin-2-ylidene]methyl]-1-butenyl]-,hydroxide, inner salt (8CI); 3,3'-Di(g-sulfopropyl)-4,5,4',5'-dibenzo-9-ethylthiacarbocyaninebetaine;Anhydro-4,5,4',5'-dibenzo-9-ethyl-3,3'-bis(g-sulfopropyl)thiacarbocyanine hydroxide;Anhydro-9-ethyl-3,3'-bis(3-sulfopropyl)-4,5,4',5'-dibenzothiacarbocyaninehydroxide