2-Oxo-1,2-dihydro-1,8-naphthyridine derivatives characterized by bearing a specific substituent, —X—R6, at the 3-position and a cyclic substituent, R5, at the 4-position; or salts thereof. The derivatives and the salts are useful as drugs, particularly preventive or therapeutic agents for respiratory diseases related to PDE IV.
2-氧代-1,2-二氢-
1,8-萘啶衍
生物,其在3位上带有特定取代基——X—R6,在4位上带有环状取代基R5;或其盐。这些衍
生物和盐可用作药物,特别是用于与PDE IV有关的呼吸系统疾病的预防或治疗剂。