Seven Flavonol derived of 2'-hydroxycalone are 2- (2-methoxyphenyl) -3-hydroxy-4H-kromen-4-on (F4), 2- (3-methoxyphenyl) -3-hydroxy-4H-kromen-4-7 on (F5), 2- (4-methoxyphenyl) -3-hydroxy-4H-kromen-4-on (F6), 2- (2,3-dimetoksifenil) -3-hydroxy-4H-kromen-4-on (F7), 2- (2,5-dimethoxyphenyl) -3-hydroxy-4H-kromen-4-on (F8), 2- (3,4-dimetoksifenil) -3-hydroxy-4H-kromen-4-on (F9) and 2- (3,4,5-dimetho…