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.

巴比妥酸镇静催眠作用，当它的五位亚甲基上的两个氢烃基取代后才呈现镇静催眠的生理活性，是一枢神经系统起抑制作用的化合物。