Studies on chemical constituents in stem of Dendrobium chrysotoxum

OBJECTIVE To investigate the chemical constituents of Dendrobium chrysotoxum. METHOD The chemical constituents were isolated by various column chromatographic methods and structurally elucidated by spectral evidences. RESULT Ten compounds were obtained and identified as (+)-syringare sinol (1), 5alpha, 8alpha-epidioxy-24( R)-methycholesta-6, 22-dien-3beta-ol (2), trans-3-(4-hydroxy-3-methoxyphenyl)-acrylic acid octacosyl ester (3), defusin (4), 3, 4-dihydroxy benzoic acid (5), 3, 4-dimethoxy-benzoic acid (6), vanillic acid (7), 3, 4-dimethoxy-benzoic acid methyl ester (8), 3, 5-dibromo-2-aminobenzaldehyde (9), heptadecanoic acid 2, 3-dihydroxy-propyl ester (10). CONCLUSION Compounds 1, 2 and 6-10 were isolated from this plant for the first time.