Samples. Fruits were collected at random from trees in Tongzhou
County, Beijing City, China, in October 2011. The sample consisted of
20 fruits and was freeze-dried. The peels were divided from the freezedried
fruits and deposited in a cool and dry place prior to analysis. It
was authenticated by Professor Yan-Jiang Qiao. A voucher specimen
was deposited at the Center of Scientific Experiment, Beijing
University of Chinese Medicine, Beijing, China.