Abstract: The invention relates to a compound selected from the group consisting of compounds of the formula: ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 are independently selected from hydrogen, halogen, trifluoromethyl, nitro, C.sub.1-4 alkoxy and C.sub.1-4 alkyl,R.sub.4 represents a heterocyclic radical selected from the radicals having the formulae ##STR2## in which R.sub.5 and R.sub.6 are independently selected from hydrogen, C.sub.1-4 alkyl, phenyl and halophenyl,R.sub.7 is selected from hydrogen and C.sub.1-4 alkyl, and a pharmaceutically acceptable acid addition salt thereof. These compounds are useful for the treatment of gastric ulcers.

Abstract: This invention relates to compounds having the general formula: ##STR1## in which: R.sub.1 represents a hydrogen atom or a (C.sub.1-4) alkyl radical,R.sub.2 represents a hydrogen atom, a (C.sub.1-4) alkyl radical, a (C.sub.2-4) alkenyl radical, a (C.sub.1-4) alkoxy-(C.sub.1-4) alkyl radical or a tetrahydrofuryl- or tetrahydropyranyl-(C.sub.1-4) alkyl radical,R.sub.3 represents a hydrogen atom or a (C.sub.1-4) alkyl radical, andR.sub.4 represents a hydrogen atom or a (C.sub.1-4) alkyl radical, and their pharmaceutically acceptable acid addition salts.Said compounds have valuable bronchodilator properties.