The invention provides a compound or its pharmaceutically-acceptable salt of formula
wherein A
1
is a hydrogen, etc.; j and k are 0 or 1;
is a double bond, etc.;
is a double bond, etc.;
one of W
1
and W
2
is E-O—W, etc., and the other is a hydrogen atom, etc.; E is a divalent group derived from a benzene ring, etc., by removing two hydrogen atoms therefrom; W is a group of formula (II-1):
which has a histamine-H3 receptor antagonistic effect or a histamine-H3 receptor inverse-agonistic effect and is useful for prevention or remedy of metabolic system diseases, circulatory system diseases or nervous system diseases.
本发明提供以下化合物或其药学上可接受的盐:其中A1为氢等;j和k为0或1;为双键等;为双键等;W1和W2中的一个为E-O-W等,另一个为氢原子等;E为由苯环衍生的二价基团,通过从中去除两个氢原子而得到;W为式(II-1)的基团:其具有
组织胺H3受体拮抗作用或
组织胺H3受体反向激动剂作用,并且对于预防或治疗代谢系统疾病、循环系统疾病或神经系统疾病是有用的。