Prof. Xinjun Luan from Northwest University visited our group Date:Nov 29, 2019 Read times: Dr. Xinjun Luan, visited our group and college of chemistry on Nov. 27, 2019, and gave us a wonderful lecture entitled with A new strategy and method of screw ring construction. PreNews: Prof. Guozhu Zhang from Shanghai Institute of Organic Chemistry visited our group NextNews: Prof. Qian Wan from Huazhong University of Science and Technology visited our group