1H-Imidazo(4,5-b)quinoxalinium, 2-(3-(1,3-diethyl-1,3-dihy dro-2H-imidazo(4,5-b)quinoxalin-2-ylidine)-1-propenyl)-1,3-diethyl-, chloride 2-(3-(1,3-Diethyl-1,3-dihy dro-2H-imidazo(4,5-b)quinoxalin-2-ylidine)-1-propenyl)-1,3-diethyl-1H-imidazo(4,5-b)quinoxalinium chloride 4742-50-1