Two new biphenyls from the stems of Garcinia tetralata

Two new biphenyls (1 and 2) and three known xanthones (35) were isolated from the ethanol extract of the stems of Garcinia tetralata. Structural elucidations of 12 were elucidated by spectroscopic methods including extensive 1D- and 2D-nuclear magnetic resonance spectroscopy techniques. Compounds 12 showed anti-rotavirus activities with SI above 10.