Year 2007, Month 4 (Section Full Articles, Page 823)
Four new steroid glycosides from the Vietnamese starfish Linckia laevigata
A. A. Kicha, N. V. Ivanchina, A. I. Kalinovsky, P. S. Dmitrenok, E. V. Sokolova, I. G. Agafonova, J. Morre, and V. A. Stonik
Eighteen steroid compounds, including four new steroid glycosides, viz., linckosides L3—L6, along with the previously known nine glycosides and five free polyhydroxysteroids, were isolated from the starfish Linckia laevigata collected on the Vietnamese coast. New compounds contain the 2-O-methyl-β-D-xylopyranosyl unit at the C(3) atom of polyhydroxylated steroidal aglycone. Two of these compounds are monosides, and the other two belong to biosides and have an additional β-D-xylopyranosyl residue at C(26) in the side chain of the aglycone. The structures of the new compounds were determined by NMR spectroscopy, mainly by 2D NMR, and mass spectrometry.
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