Butanolides as a common feature of iryanthera lancifolia and virola surinamensis

A comparative phytochemical study between pericarps of Iryanthera lancifolia and Virola surinamensis showed that the first one contains a new pair of epimeric 2-alkenyl- γ -lactones, besides an aryltetralinic lignan and one tocotrienol, while the second species contains the lignans, galgravin and veraguensin, seven juruenolides : juruenolides C, D, F, G and epi -juruenolides D, F, G, together with three pairs of epimeric aliphatic 2-alkenyl- γ -lactones. Juruenolide F, epi -juruenolides D, F, G and the 2-alkenyl- γ -lactones are new natural compounds.