Plumbagin (Plumbaein) is a yellow dye, formally derived from naphthoquinone. It is named after the plant genus Plumbago, from which it was originally isolated. It is also commonly found in the carnivorous plant genera Drosera and Nepenthes. It is also a component of the black walnut drupe.
Isoshinanolone shows excellent toxicity with LC(50) values of 1.26 microg/mL. trans-Isoshinanolone shows cytotoxicity against MDA-MB-231 breast cancer cells.