Chemical Constituents from the Aerial Parts of Cyrtopodium paniculatum.

We report the first phytochemical study of the neotropical orchid Cyrtopodium paniculatum . Eight new compounds, including one phenanthrene 1 , one 9,10-dihydro-phenanthrene 2 , one hydroxybenzylphenanthrene 3 , two biphenanthrenes 4 - 5 , and three 9,10 dihydrophenanthrofurans 6 - 8 , together with 28 known phenolic compounds, mostly stilbenoids, were isolated from the CH₂Cl₂ extract of its leaves and pseudobulbs. The structures of the new compounds were established on the basis of extensive spectroscopic methods.