A tetrahydrobenzimidazole derivative represented by formula (I): ##STR1## wherein Het represents a heterocyclic group which may be substituted with 1 to 3 substituents selected from the group consisting of a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cycloalkyl-lower alkyl group, an aralkyl group, a lower alkoxy group, a nitro group, a hydroxyl group, a lower alkoxycarbonyl group, and a halogen atom; and X represents a single bond or --NH-- which is bonded to the carbon atom or nitrogen atom of the heterocyclic ring, or a pharmaceutically acceptable salt thereof. The compound of formula (I) and a salt thereof exhibits antagonism against 5-HT.sub.3 receptor.
公式(I)所代表的四氢
苯并咪唑衍
生物:##STR1## 其中Het代表一个杂环基团,该基团可以被1至3个取自以下基团的取代基所取代:较低的烷基基团、较低的烯基基团、较低的炔基基团、环烷基-较低烷基基团、芳基烷基基团、较低的烷氧基、硝基、羟基、较低的烷氧羰基基团和卤素原子;X代表与杂环环的碳原子或氮原子相结合的单键或--NH--,或其药学上可接受的盐。公式(I)化合物及其盐表现出对5-HT3受体的拮抗作用。