Structure of eximisoside A, a novel triterpene glycoside from the Far-Eastern sea cucumber psolus eximius.
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.
Kalinin
V I
VI
Pacific Institute of Bioorganic Chemistry, Far East Division of Russian Academy of Sciences, Vladivostok, Russia. kav@piboc.marine.su
Avilov
S A
SA
Kalinina
E Y
EY
Korolkova
O G
OG
Kalinovsky
A I
AI
Stonik
V A
VA
Riguera
R
R
Jiménez
C
C
D000818:Animals; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D006027:Glycosides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D012616:Sea Cucumbers / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014315:Triterpenes / Q000737:chemistry*
D006027:Glycosides; D014315:Triterpenes; C108203:eximisoside A