Described herein are pyrazolo[1,5-a]pyridine-3-carboxylic acid derivatives represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 individually mean a hydrogen atom or a lower alkyl group, R.sub.3 denotes an azabicyclo group containing a tertiary nitrogen atom, and Y stands for --O-- or --NH--, or salts thereof. Their preparation process and serotonin receptor antagonists containing them as active ingredients are also described.
                            本文描述了由以下式子(I)表示的
吡唑并[1,5-a]吡啶-3-羧酸衍
生物:##STR1## 其中R.sub.1和R.sub.2分别表示氢原子或低碳基,R.sub.3表示含有三级氮原子的
氮杂双环基团,Y代表--O--或--NH--,或其盐。还描述了它们的制备过程和包含它们作为活性成分的5-羟
色胺受体拮抗剂。