Different Hypotentive Effects of Various Active Constituents Isolated from Uncaria rhynchophylla A New Uncaria rhynchophylla Cultivar‘Yaoyuan Gouteng 2’ A New Uncaria rhynchophylla Cultivar‘Yaoyuan Gouteng 2’ Determination of rhynchophylline and isorhynchophylline in Uncaria rhynchophylla by HPLC Protective effect of Uncaria rhynchophylla total alkaloids pretreatment on hippocampal neurons after acute hypoxia