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.

巴比妥酸本身催眠作用，当它的五位亚甲基上的两个氢烃基取代后才呈现催眠的生理活性，对中枢神经系统起抑制作用的化合物。