Eight prenylated xanthones, bannaxanthones A–H (1–8), together with seven known compounds, were
isolated from the acetone extract of the twigs of Garcinia xipshuanbannaensis. Their structures were elucidated
by spectroscopic data interpretation. The cytotoxic activities of these compounds were evaluated
using the MTT method. The results showed that xanthones with an unsaturated prenyl group had stronger
cytotoxic activity against cancer cells, whereas those with hydroxylated prenyl groups had none.