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Three new glycosides, named as saurobaccioside A ( 1 ), saurobaccioside B ( 2 ), saurobaccioside C ( 3 ), together with five known magastigmanes, canangaionoside ( 4 ), (6 S ,9 S )-roseoside ( 5 ), cucumegastigmane I ( 6 ), icariside B5 ( 7 ), linarionoside A ( 8 ) were isolated from the whole plant of  Sauropus bacciformis  (L.) Airy Shaw. Their structures were established by extensive spectroscopic analysis (UV, IR, HR-ESI-MS and NMR) and by comparison of the spectral data with those reported in the literature. The absolute configurations of compounds  2  and  3  were elucidated by experimental CD spectra. Compounds  1 - 8  were screened their cytotoxic activities towards CAL27 and MDAMB231 cancer cell lines. Compound  1  exhibited significant cytotoxic activity towards CAL27 and MDAMB231 cell lines with IC 50  values of 3.21 ± 0.23 and 4.75 ± 0.17 µM, respectively, which were smaller than those of positive control capecitabine (IC 50 : 8.20 ± 0.75 and 5.20 ± 0.89 µM). Other compounds ( 2 - 8 ) were inactive.

Saurobacciosides A - C: three new glycosides from Sauropus bacciformis with their cytotoxic activity