Abstract: Disclosed are novel compounds having the formula ##STR1## wherein R.sub.1 is a hydrogen or halogen atom, a lower alkyl, lower alkoxy, lower alkoxy lower alkyl, lower alkenyl, lower alkenyl oxy, cyano, hydroxy, trifluoromethyl, nitro, amino, aminocarbonylmethyl, lower monoalkylamino, lower dialkylamino group;R.sub.2 is a hydrogen or halogen atom, cyano, lower alkyl or lower alkoxy or acylamino group;R.sub.3 is a hydrogen or halogen atom, a lower alkyl or lower alkoxy group, while R.sub.2 and R.sub.3 together can also be a butadienyl or methylene dioxy group;R.sub.4 is a hydrogen atom or a lower alkyl group;R.sub.5 is a chlorine atom or a trifluoromethyl group;X is an alkylene group;and the non-toxic, pharmaceutically acceptable acid addition salts thereof.The compounds are suitable for treatment and prophylaxis of hypertension.