1. Vitamin K is a derivative of 1, 4-naphthoquinone . 2. Chemically, it is a derivative of naphthoquinone , related to vitamin K. 3. The chemical structure as a naphthoquinone derivative was first determined by Brockmann in 1936. 4. Several isomeric naphthoquinones are known, notably benzoquinone. 5. Lapachol, a yellow, skin-irritating naphthoquinone , is often found in the wood. 6. The unqualified term " hydroxynaphthoquinone " usually means a derivative of 1, 4-naphthoquinone . 7. The unqualified term " dihydroxynaphthoquinone " usually means a derivative of 1, 4-naphthoquinone . 8. Naphthoquinone derivatives have significant pharmacological properties.9. "' Xylindein "'is a quinone pigment, a dimeric naphthoquinone derivative. 10. A 1998 article reported that naphthoquinones originating from " N . thorelii " showed antimalarial activity.
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