Novel benzamides

A compound of the formula ##STR11## or a pharmaceutically acceptable acid addition salt thereof, wherein R.sub.1 and R.sub.2 are each hydrogen, halogen, hydrocarbyl of one to six carbon atoms, inclusive alkoxy of 1 to 12 carbon atoms, inclusive, nitro, amino, alkylamino of 1 to 12 carbon atoms, inclusive, dialkylamino, each alkyl of 1 to 12 carbon atoms, inclusive, acylamino with alkyl of 1 to 12 carbon atoms, inclusive, or trihalomethyl;

• R.sub.3 is hydrogen, alkyl of 1 to 4 carbon atoms, inclusive, cycloalkyl of 3 to 8 carbon atoms, inclusive, aryl of 6 to 12 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, or aryl of 6 to 12 carbon atoms, inclusive, substituted with halogen, alkoxy of 1 to 4 carbon atoms, inclusive, halogen-substituted alkyl of 1 to 4 carbon atoms, inclusive, or halogen-substituted alkoxy of 1 to 4 carbon atoms, inclusive, R.sub.4 is hydrogen, bromine, fluorine, iodine, hydrocarbyl of 1 to 12 carbon atoms, inclusive, or halogen-substituted hydrocarbyl of 1 to 12 carbon atoms, inclusive;
• R.sub.5 is nitro, amino, acylamino with alkyl of 1 to 12 carbon atoms, inclusive, alkylamino with alkyl of 1 to 12 carbon atoms, inclusive, dialkylamino with each alkyl of 1 to 12 carbon atoms, inclusive, aryloxy of 6 to 12 carbon atoms, inclusive, or a group R.sub.4 as previously defined;
• R.sub.6 is chlorine, or a group R.sub.5 as defined above;
• n is an integer of from 1 to 2;
• provided that when R.sub.4, R.sub.5 and R.sub.6 are each hydrogen or when R.sub.4 and R.sub.5 are hydrogen and R.sub.6 is alkyl of one to twelve carbon atoms, inclusive, amino or nitro, then at least one of R.sub.1 and R.sub.2 is halogen, phenyl, alkoxy of 1 to 12 carbon atoms, inclusive, alkylamino with alkyl of 1 to 12 carbon atoms, inclusive, dialkylamino with each alkyl of 1 to 12 carbon atoms, inclusive, acylamino with alkyl of one to 12 carbon atoms, inclusive, or trihalomethyl.