Plant material and extraction
The herb was collected from Guanling County of Guizhou Province, PR China. A voucher specimen (GUCM-VS-2018-001) of HL is preserved in College of Pharmacy, Guizhou University of Traditional Chinese Medicine. The preparation of freeze-dried powder of HL was shown in our previous experiment (Li et al., 2020). The yield of the freeze-dried powder is 12.65% (w/w).