The biruet can develop the color with the cupric sulfate in the alkaline solution, we call that the biruet reaction.Malonyl urea has acidity, so we call it barbituric acid.

巴比妥酸本身无镇静催眠作用，当它的五位亚的两个氢烃取代现镇静催眠的生理活性，是一类对中枢神经系统起抑制作用的化合物。