Cholpisut Tantapakul

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A new amide, zanthorhetsamide (1), along with nine known compounds (2-10) was isolated from the roots and stem barks of Zanthoxylum rhetsa. The structure was characterized by spectroscopic methods. In addition, the antibacterial activity of the isolates was evaluated. Dihydrochelerythrine (4) exhibited strong activity against methicillin-resistant(More)
The first phytochemical investigation of Garcinia propinqua has led to the isolation and identification of three new compounds, including two rearranged benzophenones, doitunggarcinones A (1) and B (2), and a xanthone, doitunggarcinone C (3), together with seven known compounds (4-10). The structures of 1-3 were elucidated on the basis of spectroscopic(More)
Two new dammaranes, dysomollisol (1) and dysomollisone (2), along with seven known compounds (3-9) were isolated and identified from the fruits of Dysoxylum mollissimum. The structures of these compounds were determined on the basis of spectroscopic analyses, including 1D and 2D NMR, UV, IR and mass spectrometry. The antibacterial activity and cytotoxicity(More)
Nahuoic acids A-E (1-5) have been isolated from laboratory cultures of a Streptomyces sp. obtained from a tropical marine sediment. The structures of the new polyketides 2-5 were elucidated by analysis of spectroscopic data of the natural products and the chemical derivatives 6 and 7. Nahuoic acids 1-5 are in vitro inhibitors of the histone(More)
The first phytochemical investigation of Glycosmis puberula twigs led to the isolation and identification of a new quinolone alkaloid, glycosmispuberulone (1), along with ten known compounds (2-11). The structures were elucidated by spectroscopic analyses and comparison with previously reported data. Their antibacterial activities against Gram-positive and(More)
The title compound, C(33)H(42)O(5), known as xerophenone A {systematic name: (1R,3R,4R,6S,8E,10R)-10-hy-droxy-8-[hy-droxy(phen-yl)methyl-ene]-4-methyl-1,6-bis-(3-methyl-but-2-en-1-yl)-3-(3-methyl-but-3-en-1-yl)-11-oxatricyclo-[4.3.1.1(4,10)]undecane-7,9-dione} is a naturally occurring rearranged benzophenone compound which was isolated from the twigs of(More)
A new xanthone derivative, methyl 8-hydroxy-3-hydroxymethylxanthone-1-carboxylate (1), and seven known compounds, 8-hydroxy-3-methylxanthone-1-carboxylate (2), methyl 8-hydroxy-6-methylxanthone-1-carboxylate (3), ergosterol (4), cyathisterone (5), ergosta-4,6,8(14),22-tetraen-3-one (6), calvasterone (7) and 2-hexyl-3-methylmaleic anhydride (8) were first(More)
Two new benzophenones (1 and 2) and four new xanthones (4-6 and 17) together with 24 known compounds (3, 7-16, and 18-30) were isolated from the roots and twigs of Cratoxylum sumatranum ssp. neriifolium. Their structures were elucidated by spectroscopic methods. Compounds 5 and 26 showed antibacterial activity against Micrococcus luteus, Bacillus cereus,(More)
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