*4.1. Plant Materials*

All the samples in this study were collected from the Guangxi Province of China. Fresh leaves of *M. cochinchinensis* and *M. tricolor* were collected from Qinzhou city, and fresh leaves of *M. bibracteolatus* were collected from Chongzuo city. The three samples were identified by Yonghua Li, who is from the College of Pharmacy, Guangxi University of Traditional Chinese Medicine. The collected fresh leaves were stored in a −80 ◦C refrigerator until use.
