Caraganaphenol A (I), a new tetrameric stilbene, was isolated from the
root of Caragana chamlagu LAMARK (Leguminosae) along with (+)-alpha-v
iniferin (2) and kobophenol A (3). The stereostructure of 1 was sugges
ted using NMR techniques (H-1-detected heteronuclear multiple quantum
coherence (HMQC), H-1-detected heteronuclear multiple bond connectivit
y (HMBC), and nuclear Overhauser effect (NOE) difference spectra).