The invention concerns a compound of formula (I):
Wherein A, l, m, n, R1 and R2 are as defined herein. The compounds of this invention are useful as medicaments, particularly, in the treatment of disorders improved by modulation of the histamine H
3
receptor.
                            这项发明涉及一种化合物,其
化学式为(I):其中A、l、m、n、R1和R2如本文所定义。本发明的化合物可用作药物,特别是在通过调节
组胺H3受体改善的疾病治疗中。