| abstract |
(57) [Summary] [Structure] The following general formula (I): (In the formula, R 1 is a hydrogen atom, an alkyl group, an alkenyl group, Lower alkynyl group and the like, R 2 is a hydrogen atom or a lower alkyl group, R 3 and R 4 are the same or different and represent a hydrogen atom, lower alkyl, lower alkenyl, acyl and the like) or a diazabicyclo derivative or an acid addition salt thereof. Or a quaternary ammonium salt. [Effect] The present compound is a 5-HT 3 receptor having 5-H It is useful as a selective antagonist for T. |