1,3'-Diethyl-2,2'-quinolyloxacarbocyanine iodide 1-Ethyl-2-(3-(3-ethyl-3H-benzoxazol-2-ylidene)prop-1-enyl)quinolinium iodide 57282-57-2 72998-56-2 Cyanine dye 2 EINECS 277-194-0