[Chemical constituents of Eucommia ulmoides].

To study the chemical compositions of Eucommia ulmoides.The compounds were isolated and purified from Eucommia ulmoides by silica gel column chromatography, Sephadex LH-20, MPLC packed with MCI gel and semi-preparative HPLC. The structures of these compounds were established on the basis of spectral analyses (1H-NMR, 13C-NMR and MS).Thirteen compounds were obtained,and their structures were identified as betulin (1), syringin (2), pervoside A...