Phrygiasterol, a cytotoxic cyclopropane-containing polyhydroxysteroid, and related compounds from the pacific starfish Hippasteria phrygiana.

@article{Levina2005PhrygiasterolAC,
  title={Phrygiasterol, a cytotoxic cyclopropane-containing polyhydroxysteroid, and related compounds from the pacific starfish Hippasteria phrygiana.},
  author={Eleonora V. Levina and Anatoly I. Kalinovsky and Polina V Andriyashenko and Pavel S. Dmitrenok and Dmitry Aminin and Valentin A Stonik},
  journal={Journal of natural products},
  year={2005},
  volume={68 10},
  pages={
          1541-4
        }
}
The new cyclopropane-containing steroid phrygiasterol (1) and steroid glycoside phrygioside B (2), along with previously known borealoside C (2a) and (20R,24S)-5alpha-cholesta-3beta,6alpha,8,15alpha,24-pentaol (3), have been isolated from the Pacific starfish Hippasteria phrygiana. On the basis of spectroscopic analyses, using 1D and 2D NMR techniques and some chemical transformations, the structures of 1 and 2 have been established as (20R,24R,25R)-24,26-cyclo-5alpha-cholesta-3beta,6alpha,8… 
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