| abstract |
There are provided compounds which can be used in the treatment of diseases mediated by the autophosphorylation of a PDGF receptor, specifically, compounds which can inhibit neointima formation hypertrophy. The compounds are those represented by formula (I) or pharmacologically acceptable salts or solvates thereof: n n n wherein R 1 and R 2 represent hydrogen, alkyl or the like; R 3 , R 4 , R 5 and R 6 represent hydrogen, halogen, alkyl, alkoxy or the like; R 11 and R 12 represent hydrogen, alkyl, alkylcarbonyl or the like; and A represents any one of formulae (i) to (x), provided that compounds wherein R 3 , R 4 , R 5 and R 6 represent hydrogen and A represents group (v) wherein u is 0 (zero) and R 19 represents phenyl optionally substituted by halogen, alkyl, or alkoxy are excluded. |