| abstract |
[Constitution] A compound represented by the formula [I], n [Chemical Formula 1] n n [wherein X stands for a methine group or a nitrogen atom; R¹ stands for a hydrogen atom, an optionally substituted lower alkyl group or a halogen atom; R² and R³ respectively stand for a hydrogen atom or an optionally substituted lower alkyl group, or, taken together, may form a 5- to 7-membered ring combined with the adjacent -C=C-; R⁴ and R⁵ respectively stands for a hydrogen atom or an optionally substituted lower alkyl group or, taken together, form a 3- to 7-membered homo- or hetero-cyclic ring combined with the adjacent carbon atom; A stands for an optionally substituted amino group; m and n denote 1 to 4, respectively], salts thereof, a method of preparing same or pharmaceutical compositions containing same. n [Effects] Excellent antiasthmatic agents |