A compound selected from the group consisting of a compound of the formula ##STR1## wherein the substituents are defined as in the specification having antagonist properties to histamine H.sub.3 -receptors.
从以下化合物组中选择一种化合物,该化合物具有对
组胺H.sub.3受体具有拮抗作用的公式##STR1##中所定义的取代基,如规范中所述。