Imidazonaphthyridine derivatives

摘要

PCT No. PCT/JP92/01532 Sec. 371 Date Aug. 31, 1994 Sec. 102(e) Date Aug. 31, 1994 PCT Filed Nov. 24, 1992 PCT Pub. No. WO93/11127 PCT Pub. Date Jun. 10, 1993.The present invention relates to novel imidazonaphthyridine derivatives represented by the following formulae: <IMAGE> <IMAGE> wherein R represents hydrogen, lower alkyl or -CH2R1 (where R1 represents phenyl or pyridyl) and pharmaceutically acceptable salts thereof. The compounds exhibit excellent anti-allergic, anti-inflammatory and anti-asthmatic activities.