3-Ethyl-2-(3-(1-ethylnaphtho(1,2-d)thiazol-2(1H)-ylidene)-1-propenyl)naphtho(1,2-d)thiazolium salt with 4-methylbenzenesulfonic acid (1:1) 54290-15-2 Naphtho(1,2-d)thiazolium, 3-ethyl-2-(3-(1-ethylnaphtho(1,2-d)thiazol-2(1H)-ylidene)-1-propenyl)-, salt with 4-methylbenzenesulfonic acid (1:1)