Novel naphthoquinones from Heterophragma adenophyllum

A new symmetric naphthoquinone dimer, dilapachone (1), and a novel asymmetric naphthoquinone dimer, adenophyllone (2), were isolated from the heartwood of Heterophragma adenophyllum. Their structures were elucidated by spectroscopic means including high-resolution mass, UV, IR, 1D- and 2D-NMR spectroscopy.