Benzonaphthyridine derivatives and their use for treating airway disorders and dermatoses

摘要

These compounds, which are useful for treatment of airway disorders and dermatoses, are of the formula I where: R1 is alkyl. R2 and R3 are OH, alkoxy, cycloalkyl, cycloalkylmethoxy or Fl substituted alkoxy or R2 and R3 are a alkylenedioxy group; and R4 is an optionally substituted phenyl.