1,3-Dimethyl-1H-imidazo(4,5-b)quinoxalinium toluene-p-sulphonate 1H-Imidazo(4,5-b)quinoxalinium, 1,3-dimethyl-, salt with 4-methylbenzenesulfonic acid (1:1) 67892-67-5 EINECS 267-595-9