Cinnamylphenols from Phyllodium pulchellum.

Four new cinnamylphenols, pulchelstyrenes A (1), B (2), C (3), and D (4), together with citrusinol, yukovanol, methyl piperitol, and 4-hydroxy-2,3-dimethoxybenzaldehyde were isolated from the aerial part of Phyllodium pulchellum. The structures of these compounds were determined by spectroscopic methods. Compounds 2, 3, and citrusinol exhibited marginal cytotoxicity against KB cells, and citrusinol also showed mild cytotoxicity against the HepG2 cell line.