1. Department
of Chemistry, Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory
for High-Throughput Experimentation, University of Pennsylvania, 231
South 34th Street, Philadelphia, Pennsylvania 19104, United States
2. Key
Laboratory of Medicinal Chemistry for Natural Resource (MOE), School
of Chemical Science and Technology, Yunnan University, Kunming 650091, China
3. Dpto.
Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain
4. Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology, Sichuan University, No. 29, Wangjiang Road, Chengdu, Sichuan 610064, China