A Biphenanthrene and a Phenanthro[4,3-<i>b</i>]furan from the Orchid <i>Bulbophyllum </i><i>v</i><i>aginatum</i>

2004-09-24T00:00:00Z (GMT) by Yuan-Wah Leong Leslie J. Harrison
Two minor metabolites of the whole plant of <i>Bulbophyllum</i> <i>vaginatum</i> collected in Singapore were identified as the biphenanthrene <b>1</b> and the phenanthro[4,3-<i>b</i>]furan derivative <b>2</b>. Structure determinations were performed using a combination of 1D and 2D NMR techniques.