In addition to jaslanceosides B (1) and E (2), and jasminoside (3), a new s
ecoiridoid glucoside, isojasminoside (4) was isolated from the leaves of Ja
sminum amplexicaule (Oleaceace). The structure of 4 was determined on the b
asis of spectral analysis and chemical reactions. Chemotaxonomy for some se
lected plants in Jasminum is also discussed.