The present invention relates to a compound represented by general formula (I), a method for preparing said compound, a pharmaceutical formulation containing said compound, and the use of said compound in manufacture of a medicament for treating or preventing the fibrous degeneration disease and treating the excessive proliferation disease: wherein ring A, X, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , a, b and n are defined as those in the description.
