Plant Material. The aerial parts of U. macrophylla were collected
from Xishuangbanna, Yunnan Province, People’s Republic of China,
in April 2009, and were identified by Prof. Xiao Cheng of the Kunming
Institute of Botany, Chinese Academy of Sciences. A voucher specimen
(No. 200904U01) has been deposited in the State Key Laboratory of
Phytochemistry and Plant Resources in West China, Kunming Institute
of Botany, Chinese Academy of Sciences.