2,2'-(Oxybis(p-phenyleneazo-p-phenylene(ethylimino)))bis(tetraethylammonium) bis(4-nitrotoluene-2-sulphonate) 64490-86-4 EINECS 264-919-0 Ethanaminium, 2,2'-(oxybis(4,1-phenyleneazo-4,1-phenylene(ethylimino)))bis(N,N,N-triethyl-, salt with 2-methyl-5-nitrobenzenesulfonic acid (1:2)