Five novel oligostilbenes from the roots of Caragana sinica

One novel resveratrol trimer, caraphenol A (1), and four novel resveratrol dimers, (+)-isoampelopsin F (2), caraphenol B (3), C (4), (−)-ampelopsin F (5) were isolated from the roots of C. sinica. Their structures and stereochemistry were elucidated by means of spectroscopic evidence, especially HMBC and NOE experiments. The pharmacological activities in anti-HIV of all compounds and stimulation of osteoblast growth tests of the EtOAc extract of the roots of C. sinica have been determined.