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Chemical constituents in roots of Ilex asprella Chemical constituents in roots of Ilex asprella Triterpenoid constituents in fruits of Psidum guajava Triterpenes from aerial parts of Clematoclethra scandens subsp. actinidioides Chemical constituents of stems and leaves of Salvia yunnanensis and their anti-angiogeneic activities A Study on Chemical Constituents in the Herb of Mentha spicata