<p>A new flavone <i>C</i>-glycoside, apigenin 6-<i>C</i>-<i>α</i>-arabinofuranosyl 8-<i>C</i>-<i>α</i>-arabinopyranoside (<b>1</b>) and a new bibenzyl, bulbotetusine (<b>2</b>), were isolated from the tubers of <i>Bulbophyllum retusiusculum</i>. Their structures were established on the basis of extensive spectroscopic analyses. The absolute configuration of <b>2</b> was determined by the comparison of experimental and calculated electronic circular dichroism. Compounds <b>1</b> and <b>2</b> showed no obvious cytotoxic activity against any five human tumour cell lines with IC<sub>50</sub> values >40 μM.</p
