Structure of eximisoside A, a novel triterpene glycoside from the Far-Eastern sea cucumber psolus eximius.

@article{Kalinin1997StructureOE,
  title={Structure of eximisoside A, a novel triterpene glycoside from the Far-Eastern sea cucumber psolus eximius.},
  author={Vladimir I. Kalinin and Sergey A. Avilov and Elena Yu. Kalinina and O. G. Korolkova and Anatoly I. Kalinovsky and Valentin A Stonik and Ricardo Riguera and Carlos Jim{\'e}nez},
  journal={Journal of natural products},
  year={1997},
  volume={60 8},
  pages={
          817-9
        }
}
The new triterpene saponin eximisoside A (1) has been isolated from the Far-Eastern sea cucumber Psolus eximius and its structure elucidated by 1D and 2D NMR (13C, 1H, 1H-1H COSY, HMQC, and NOESY spectra), and FABMS studies. The structural features of eximisoside A (1) are the rare presence of a 23 double bond in the aglycon and the absence of quinovose, typically found in the oligosaccharide chain of holothurian glycosides. 
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