Inhibition of glycyrrhetic acid on proliferation in K562 cells and its mechanism Study on pharmacokinetics of glycyrrhetic acid in rats by RP-HPLC Isolation and Identification of Echinatin from Cultured Cells of Glycyrrhiza uralensis Chemical constituents of triterpenoid saponins from Glycyrrhiza uralensis Study on supercritical CO_2 extraction process of glycyrrhetic acid in Glycyrrhiza uralensis