The Isolation and Structures of Novel Neolignans and Neosesquilignans from Heterotropa takaoi M.

Several novel neolignans and neosesquilignans represented by heterotropanone and heterotropatrione, respectively, have been isolated from the plant Heterotropa takaoi M. and their structures also been elucidated on the basis of their spectral data closely related to that of asatone. From a biogenetic point of view, furthermore, these neolignans and neosesquilignans were chemically correlated to one another.