134049-68-6 3,5-Dihydro-5-butyl-3-ethyl-4H-imidazo(4,5-c)quinolin-4-one monohydrochloride 4H-Imidazo(4,5-c)quinolin-4-one, 3,5-dihydro-5-butyl-3-ethyl-, monohydrochloride 5-n-Butyl-3-ethyl-3H,5H-imidazo(4,5-c)quinolin-4-one hydrochloride