1,5-Dihydro-5-butyl-1-methyl-4H-imidazo(4,5-c)(1,8)naphthyridin-4-one 139482-11-4 4H-Imidazo(4,5-c)(1,8)naphthyridin-4-one, 1,5-dihydro-5-butyl-1-methyl- 5-Butyl-1-methyl-1H-imidazo(4,5-c)(1,8)naphthyridin-4(5H)-one