| abstract |
5-Aminoflavone derivative represented by the formula:n n wherein R¹, R², R³ and R⁴ are the same or different and represent hydrogen, substituted or unsubstituted lower alkyl, lower alkenyl, halogen-substituted or unsubstituted lower alkanoyl or lower alkoxycarbonyl; X¹, X², Y¹ and Y² are the same or different and represent hydrogen or halogen; provided that at least one of X¹ and X² represent halogen. |