Synonyms: 1-Methyl-2-[b-[(1-methylnaphtho[1,2-d]thiazolin-2-ylidene)methyl]styryl]naphtho[1,2-d]thiazoliumchloride (7CI); Naphtho[1,2-d]thiazolium,1-methyl-2-[3-(1-methylnaphtho[1,2-d]thiazol-2(1H)-ylidene)-2-phenyl-1-propenyl]-,chloride (9CI); Naphtho[1,2-d]thiazolium, 1-methyl-2-[3-(1-methylnaphtho[1,2-d]thiazolin-2-ylidene)-2-phenylpropenyl]-,chloride (8CI); 3,3'-Dimethyl-9-phenyl-4,5,4',5'-dibenzothiacarbocyaninechloride; 3,3'-Dimethyl-9-phenyl-4,5,4',5'-naphthothiacarbocyanine chloride