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To study the chemical constituents of stem of Camellia oleifera.The chemical constituents were isolated and purified by column chromatography on silica gel, ODS, Sephadex LH-20 and MPLC. Their structures were elucidated on the basis of physicochemical properties and special analysis.Seven compounds were isolated from the stem of Camellia oleifera, whose structures were elucidated as (-) -pinoresinol (1), (-) -medioresinol (2), skullcapflavone II (3), betulinic acid (4), ursolic acid (5), 3-O-β-D-glucopyranosyl- (1 --2) -β-D-xylopyransoyl-(1 --3) -[β-D-glucopyranosyl- (1 --2)] -β-D-glucuronopyranosyl-22α-angeloyloxyolean-12-ene-15α,16α,28-triol (6) and oleanolic acid (7).Compounds 1 - 6 are isolated from this plant for the first time, and compounds 1 - 3 are isolated from this genus for the first time.

To study the chemical constituents of the leaves of Psidium guajava.The chemical constituents were isolated by column chromatography on silica gel, Sephadex LH-20 and MPLC. Their chemical structures were elucidated on the basis of special analysis.Seven compounds were isolated from n-butyl alcohol fraction, whose structures were elucidated as morin-3-O-α-L-arabopyranoside (1), morin-3-O-α-L-iyxopyranoside (2), 2,6-dihydroxy-4-O-β-D-glucopyranosyl-benzophenone (3), casuarictin (4),2,6-dihydroxy-3,5-dimethyl-4-O-(6"-O-galloyl-β-D-glucopyranosyl)-benzophenone(5), globulusin A(6), and kaempferol-3-O-β-D-(6"-galloyl) galactopyranoside (7).Compounds 3 and 5 ~ 7 are isolated from this plant for the first time.

To study the chemical constituents of the leaves of Liquidambarformosana.The chemical constituents were isolated and purified by column chromatography on silicagel, Sephadex LH-20 and MPLC. Their structures were elucidated on the basis of physicochemical properties and special analysis.Eight compounds were isolated from the leaves of Liquidambar formosana, whose structures were elucidated as gallic acid (1), p-hydroxy-benzoic acid (2), 3-methoxy-4-hydroxy-benzoic acid (3), 3,5-dihydroxy-4-methoxy-benzoic acid (4) kaempferol (5), 3,4-dihydroxy-benzoic acid (6), 3,4-dihydroxy-5-methoxy-benzoic acid (7) and 3β,23,29-trihydroxy-olean-12-en-28-oic acid-β-D-glucopyranosyl ester (8).Compounds 1-8 are isolated from the leaves of Liquidambar formosana for the first time.

To study the ethyl acetate-soluble chemical constituents of Callicarpa kwangtungensis.The chemical constituents were isolated by column chromatography on silica gel, Sephadex LH-20 and MPLC. Their chemical structures were elucidated on the basis of special analysis.Seven compounds were isolated from ethyl acetate part, whose structures were elucidated as caffeic acid(1),2α,3α, 19α-trihyhydroxy-urs-12-en-28-O-β-D-glucopyranoside (2),2α,3, 19α-trihyhydroxy-olean-12-en-28-O-β-D-glucopyranoside (3), 2α, 3α, 19α-trihyhydroxy-olean-12-en-28-O-β-D-glucopyranoside (4), ferulic acid (5), 2α, 3β, 19α-trihyhydroxy-urs-12-en-28-O-β-D-glucopyranoside(6), and ( + )-isolariciresinol-9-O-β-D-glucopyranoside(7).All these compounds are isolated from this plant for the first time.