RESUMO
Objective: To study the chemical constituents of Dendrobium hercoglossum. Methods: The compounds were isolated and purified by column chromatography and preparative HPLC, and their chemical structures were identified on the basis of spectral analysis. Results: Ten compounds were isolated and identified as 3,4,α-trihydroxy-5,3'-dimethoxybibenzyl (1), 4,α-dihydroxy-3,5,3'- trimethoxybibenzyl (2), 4,5-dihydroxy-3,3',α-trimethoxybibenzyl (3), 4,3'-dihydroxy-3,5-dimethoxybibenzyl (4), 4,4'-dihydroxy- 3,5,3'-trimethoxybibenzyl (5), N-trans-cinnamoyltyramine (6), protocatechuic acid (7), vanillyl alcohol (8), hexadecanoic acid 2,3-dihydroxypropyl ester (9) and syringaresinol (10). Conclusion: Compound 1 is a new compound, named dendhercoine A, compounds 2-10 are isolated from this plant for the first time.