Ebenaceae extractives. Part V. New diospyrin derivatives from Diospyros montana Roxb.

The new extractives are the dinaphthofuran 3,5′-O-cyclodiospyrin (XVI), 8′-hydroxydiospyrin, 2′- and 3′-chlorodiospyrin, 3′-chloro-2′-hydroxydiospyrin, and the chromenone ester (XIX; R = Et) and acid (XIX; R = H). The last five of these appear to be artefacts formed from diosquinone (XXI), which is also present.