To measure the blood pressure orderly in 4 weeks.Isolated SD rats aorta rings were contracted by NE, observe relaxation by the presence of different EUL concentration.

• 去甲肾上腺素预收缩内皮完整的离体SD大鼠胸主动脉血管环，累积加入不同浓度EUL溶液，观察舒张变化。