1,5-Dihydro-1-ethyl-5-phenyl-4H-imidazo(4,5-c)(1,8)naphthyridin-4-one 139339-06-3 4H-Imidazo(4,5-c)(1,8)naphthyridin-4-one, 1,5-dihydro-1-ethyl-5-phenyl-