1. State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhang Jiang Hi-Tech Park, Shanghai, 201203, Peopleʼs Republic of China, Department of Chemistry, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany, Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, and Department of Organic Chemistry, University of Debrecen, P.O.B. 20, H-4010 Debrecen, Hungary