As an aim toward developing new antiulcer agents, new N-substituted N'-[3-[3- (piperidinomethyl) phenoxy] propyl] urwrs were synthesized and evaluated for histamine H2- receptor antagonistic, gastric antisecretory, and gastric mucosal protective activities. A QSAR study showed that the most favorable N-substituents were electron-donating stmightchain alkyl groups of short length such as ethyl group from the viewpoint of dual ...