Three new biphenyl derivatives, clusiparalicolines A (1), B (2), and C (3),
were isolated from the roots of Clusia paralicola by bioassay-directed fra
ctionation using the DNA strand-scission and the KB human cancer cell line
cytotoxicity assays. Compounds 1 and 2 were found to be active in the DNA s
trand-scission assay, whereas all three compounds exhibited modest cytotoxi
city against the KB cell line. The structures of 1-3 were elucidated by spe
ctroscopic methods including 1D and 2D NMR techniques.