A series of 2-(3,4-dichlorophenyl)-4-(substituted amino)quinazolines of the formula: ##STR1## wherein R is (1-pyrrolidinyl)propyl; 3-[bis-(2-hydroxyethyl)amino]propyl; 2,3-dihydroxypropyl; 3-diethylamino-2-hydroxypropyl; or 3-hydroxypropyl and various acid salts are effective antibacterial agents.