Design, Synthesis and Biological Evaluation of Nitrate Derivatives of Sauropunol A and B as Potent Vasodilatory Agents oleh Lu Lu, Xuemin Rao, Rigang Cong, Chenxi Zhang, Zhimei Wang, Jinyi Xu, Genzoh Tanabe, Osamu Muraoka, Xiaoming Wu, Weijia Xie