Analysis on chemical constituents in ethanol extract from vanilla pod in various habitats and quantitative determination of vanillin by GC-MS Study on mechanisms of anti-asthma by Kangmin Pingchuan Formula via balance of regulatory T cells and Th17 cells GC-MS fingerprint of in vitro anti-gastric cancer active parts from roots of Uygur medicine Ferula ferulaeoides Chemical constituents in roots of Ilex kudingcha