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Chemical Constituents of the Essential Oil from the Pericarp of Trichosanthes rosthornii Harms Analysis on the Constituents of the Absolute Oil of Lysimachia foenum-graceum Hance and Study on the Application of the Insecticidal Activity of Its Components Analysis of Essential Oils in Roots and Fruits of Angelica in Northeast China Studics on Constituents in Votatile Oil of Peilanand Three Plants of the Same Genus Analysis of Chemical Constituent of Essential Oil in Lonicera japonnica Thunb. Cultivated on the Northern Plain of Henan Province Study on quality analysis of essential oil from twig and leaf of Baeckea frutescens