Cytotoxic holostane-type triterpene glycosides from the sea cucumber Pentacta quadrangularis.

@article{Han2010CytotoxicHT,
  title={Cytotoxic holostane-type triterpene glycosides from the sea cucumber Pentacta quadrangularis.},
  author={Hua Han and Qiang-zhi Xu and Hai-Feng Tang and Yang-hua Yi and Wei Gong},
  journal={Planta medica},
  year={2010},
  volume={76 16},
  pages={
          1900-4
        }
}
Two new holostane-type triterpene glycosides, named pentactasides I (1) and II (2), and a new natural product, pentactaside III (3), together with two known glycosides, philinopsides A (4) and B (5), were isolated from the sea cucumber Pentacta quadrangularis. Their structures were elucidated by extensive spectroscopic analysis and chemical evidences. Compounds 1 and 2 possess the same trisaccharide moiety which is a rare structural feature among naturally occurring sea cucumber glycosides and… 
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