To continue to study anti-tumour bioactive saponins EtOAc layer from methanol extract of the stem of psychotria sp.
four compounds were obtained by all kinds of column chromatography
such as silica gel
Sephdex LH-20
and ODS. Their structures were characterized by spectroscopy including NMR
MS
GCMS analyses
and chemical and the physical methods. The result indicated that they were Psychotrianosides G (1)
Ardisianosides D (2)
β-amyrin (3)
and Stigmasterol3-O-β-D glycosidase(4). Cyclamiretin A (5) was obtained by acid hydrolysis of 2. Psychotrianosides G(1) was firstly obtained as a natural product. The chemical structure of compound (1) was analyzed by 2D NMR firstly. Compounds 1