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New 1,4-benzoquinone derivatives, ardisiaquinones D(2), E(4), and F(5) along with the known ardisiaquinones A(1) and B(3) have been isolated from the leaves of Ardisia sieboldii (Myrsinaceae) and shown to be 5-lipoxygenase inhibitors. Their structures have been elucidated by spectroscopic analysis and chemical degradation. The degree of inhibition of 5-lipoxygenase activity by the ardisiaquinones and some derivatives of ardisiaquinone A is reported.

Naturally Occurring 5-Lipoxygenase Inhibitors. VI. Structures of Ardisiaquinones D, E, and F from Ardisia sieboldii.