| abstract |
Compounds represented by general formula (I) or salts thereof and anti-inflammatory agents and antitumor agents containing these compounds as the active ingredient, wherein R1 represents hydrogen or lower alkyl; R2 represents lower alkyl or (CH¿2?)n1 COOH (wherein n1 is 1, 2 or 3); R?3¿ represents hydrogen, halogeno, carboxy, etc.; R4 represents phenyl optionally having a specific substituent, dicyclic heteroaryl, phenylethynyl or lower alkynyl; and R5 represents lower alkyl, amino, etc. |