2,2'-((2-Carboxy-p-phenylene)bis(iminovinylene))bis(3-ethyl-4,5-dihydrothiazolium) diiodide 20328-87-4 EINECS 243-738-0 Thiazolium, 2,2'-((2-carboxy-1,4-phenylene)bis(imino-2,1-ethenediyl))bis(3-ethyl-4,5-dihydro-, diiodide