Isolation and structure determination of cypritibetquinone A and B, two new phenanthraquinones from Cypripedium tibeticum / 药学学报

ABSTRACT

<p><b>AIM</b>To study the chemical constituents of Cypripedium tibeticum.</p><p><b>METHODS</b>Compounds were isolated by repeated silica gel chromatography and purified on Sephadex LH-20 and structures were determined by spectral analysis.</p><p><b>RESULTS</b>Cypritibetquinones A and B were isolated from the ethyl acetate residue and their structures were determined as 7-hydroxy-2-methoxy-1 4-phenanthraquinone (1) and 7-hydroxy-2, 10-dimethoxy-l1 4-phenanthraquinone (2), respectively, by extensive spectral analyses.</p><p><b>CONCLUSION</b>Cypritibetquinones A and B are two new phenanthraquinones.</p>