273723-64-1 3-Ethyl-2-methylnaphtho(2,1-d)thiazolium toluene-p-sulphonate 53019-76-4 EINECS 258-300-4 Naphtho(2,1-d)thiazolium, 3-ethyl-2-methyl-, salt with 4-methylbenzenesulfonic acid (1:1)