Compounds of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 are each hydrogen or methyl, and R.sub.3 is chlorine, bromine or nitro, and non-toxic, pharmacologically acceptable acid addition salts thereof; the compounds as well as their salts are useful as tranquilizers.
式##
SPC1##的化合物,其中R.sub.1和R.sub.2分别为氢或甲基,R.sub.3为
氯、
溴或硝基,以及其非毒性、药理学上可接受的酸盐;这些化合物及其盐可用作镇静剂。