The authors are grateful to the Natural Science Foundation of China
(81225024), Collaborative Innovation Center of Southwest Ethnic Medicine
(Guangxi Normal University), (CICSEM 2013-A), the Ministry of Science
and Technology of the People's Republic of China (2014ZX09301307-003,
2013BAI11B02), and the Chinese Academy of Sciences (KSZD-EW-Z-004-
03) for partial financial support, and to the analytical group of the Laboratory
of Phytochemistry, Kunming Institute of Botany for the spectral
measurement.