New Chemical Constituents from the Bark of Leveille and their Evaluation of Antioxidant Activities.

Four new constituents, as c-6-oxogeran-4-enyl-10-oxy--β-arabinopyranosyl-4'--β-arabinopyranosyl-2''-octadec-9''',12''',15'''-trienoate (), geran-3(10)-enyl-1-oxy--β-arabinopyranosyl-4'--β-arabinopyranosyl-2''-octadec-9''',12''',15'''-trienoate (), geranilan-8-oxy---d-xylopyranosyl-2'--octadec-9'',12'',15''-trienoate (), 1-cyclohex-2', 5'-dienyl 1-cyclohexylethanol--β-d-xylopyranoside (), along with six known constituents, guaiacol--β-d-arabinopyaranoside (), -tetradecanyl oleate (), oleyl-β-d-xyloside (), -octadec-9,12-dienoyl--β-d-arabinopyranoside (), linolenyl--β-d-arabinofuranoside () andglyceryl-1,3-dipalmito-2-olein (), were isolated and identified from the bark. The new structures were established by one-and two-dimensional NMR (and in combination with IR, FAB-MSand HR-ESI-FTMS. The comparative evaluation of antioxidant potential by phosphomolybdenum, DPPH, FRAP and the NO assay of four different compounds (-), we have found that the compounds 1 and 2 have power as a natural antioxidant, whereas the compound and exhibited mild activity in comparison to compounds and .