Nudol is a

phenanthrenoid Phenanthrenoids are chemical compounds formed with a phenanthrene backbone. These compounds occur naturally in plants, although they can also be synthesized. Phenanthrols Phenanthrols are any of five isomeric phenols derived from phenanthrene (1 ...

of the orchids '' Eulophia nuda'', '' Eria carinata'', '' Eria stricta'' and ''

Maxillaria densa ''Maxillaria densa'', the crowded maxillaria, is a species of orchid ranging from Mexico south to Nicaragua. Gymnopusin is a phenanthrenediol produced by the orchid as well as 2,5-dihydroxy-3,4-dimethoxyphenanthrene, 9,10-dihydro-2,5-dihydroxy-3 ...

''.New Phenanthrene Derivatives from Maxillaria densa. Samuel Estrada, Rubén A. Toscanoand Rachel Mata, J. Nat. Prod., 1999, volume 62, issue 8, pages 1175–1178,

References

Phenanthrenoids {{aromatic-stub