Patoomratana TuchindaJinda UdchachonKanjai KhumtaveepornWalter C. TaylorLutz M. EngelhardtAllan H. WhiteMahidol UniversityThe University of SydneyUniversity of Western Australia2018-06-142018-06-141988-01-01Phytochemistry. Vol.27, No.10 (1988), 3267-3271003194222-s2.0-0000422113https://repository.li.mahidol.ac.th/handle/123456789/15484From the tubers of Eulophia nuda six phenanthrene derivatives have been isolated: 9,10-dihydro-2,5-dimethoxyphenanthrene-1,7-diol, 9,10-dihydro-4-methoxyphenanthrene-2,7-diol, 1,5-dimethoxyphenanthrene-2,7-diol, 1,5,7,-trimethoxyphenanthrene-2,6-diol, 5,7-dimethoxyphenanthrene-2,6-diol and 4,4′,8,8′-tetramethoxy [1,1′-biphenanthrene]-2,2′,7,7′-tetrol. 4-Hydroxybenzaldehyde and 4-hydroxybenzyl alcohol were also isolated. The structures were assigned by spectroscopic methods and the structure of 9, 10-dihydro-2,5-dimethoxyphenanthrene- 1,7-diol was also determined by a single-crystal X-ray structure analysis of its acetate derivative. © 1988.Mahidol UniversityAgricultural and Biological SciencesBiochemistry, Genetics and Molecular BiologyChemistryPharmacology, Toxicology and PharmaceuticsArticleSCOPUS10.1016/0031-9422(88)80040-2