Compounds of the formula ##STR1## or pharmaceutically acceptable acid addition salts thereof (for example, a chloride) are useful as local anesthetics. In the compound of the formula (I), R is hydrogen or C.sub.1 -C.sub.14 alkyl, ALK is C.sub.1 -C.sub.4 alkylene, R.sub.1 and R.sub.2 may be the same or different and are hydrogen or C.sub.1 -C.sub.6 alkyl or R.sub.1 and R.sub.2 taken together form a 5 to 7 atom ring which contains 1 to 2 nitrogen atoms.
公式##STR1##的化合物或其药学上可接受的酸盐(例如
氯化物)可用作
局部麻醉剂。在公式(I)的化合物中,R是氢或C.sub.1-C.sub.14烷基,ALK是C.sub.1-C.sub.4烷基,R.sub.1和R.sub.2可以相同也可以不同,是氢或C.sub.1-C.sub.6烷基,或者R.sub.1和R.sub.2一起形成含有1到2个氮原子的5到7原子环。