Mono and dimeric naphthalene derivatives from the roots of Diospyros assimilis

Three 2-naphthaldehydes, including the novel 4-hydroxy-3,5-dimethoxy-2-naphthaldehyde, the simple naphthoquinone plumbagin and the dimeric naphthoquinones diospyrin and 8′-hydroxyisodiospyrin have been isolated from the roots of Diospyros assimilis and their structures established by spectroscopic analysis.