| abstract |
Substituted quinolone derivatives represented by the following formula: wherein R1 represents a substituted or unsubstituted (hetero) aryl group, R2 represents H or an alkoxycar-bonyl, substituted aminocarbonyl, cyano or like group, and R3 and R4 each independently represent H or a substituted alkyl, aryl, amino or like group, and salts thereof; pharmaceuticals containing the same. These derivatives and salts have excellent anti-ulcer activities. |