 These molecules are named plicatol A, B and C.

Nudol is a phenanthrene of the orchids "Eulophia nuda", "Eria carinata" and "Eria stricta".9,10-Dihydro-2,5-dimethoxyphenanthrene-1,7-diol is a phenanthrene from "Eulophia nuda".This compound shows cytotoxic activity against human cancer cells.