The new compounds of the general Formula I ##STR1## (wherein R.sub.1 stands for C.sub.1-5 alkyl, C.sub.2-5 alkenyl, C.sub.2-5 alkinyl, C.sub.3-7 cycloalkyl or optionally substituted phenyl-(C.sub.1-4 alkyl);R.sub.2 represents hydrogen or C.sub.1-5 alkanoyl;X.sub.1 and X.sub.2 can be identical or different and each stands for hydrogen, halogen, trifluoromethyl or C.sub.1-4 alkoxy;(with the proviso that if R.sub.1 stands for ethyl, at least one of R.sub.2, X.sub.1 and X.sub.2 is different from hydrogen) and pharmaceutically acceptable acid additions salts possess valuable anxiolytic properties devoid of sedative effect and can be used in therapy.The compounds of the general Formula I can be prepared by methods known per se.