Compounds having the formula I ##STR1## and their pharamaceutically acceptable acid addition salts, wherein R.sub.1 is hydrogen or lower alkyl, A is a direct bond or lower alkylene and R.sub.2 is pyridinyl or pyridinyl monosubstituted by lower alkyl, are useful as anti-ulcer agents and, in the case where A is a direct bond, as anti-secretory agents.
具有I ##STR1## 公式及其药学上可接受的酸盐的化合物,其中R.sub.1为氢或较低的烷基,A为直接键或较低的亚烷基,R.sub.2为
吡啶基或被较低的烷基单取代的
吡啶基,可用作抗溃疡剂,当A为直接键时,可用作抗分泌剂。