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Phytochemical studies of the aerial parts of Euphorbia rigida afforded three triterpenes: betulin (1), cycloart-23Z-ene-3, 25-diol (2) and cycloartan-3, 24, 25-triol (3), firstly isolated from this plant. The structures and relative stereochemistry were determined on the basis of extensive spectroscopic analyses, including 1D and 2D NMR experiments (1H NMR,… (More)
BACKGROUND The genus Bersama belongs to the Melianthaceae family and comprises of four species (B. swinnyi, B. yangambiensis, B. abyssinica, and B. engleriana) all of which are very high trees; the latter two detected species are found in Cameroon. Previous phytochemical investigation on B. yangambiensis, B. swinnyi, and B. abyssinica led to the isolation… (More)
Three new cembrenoids, lobophylins F-H (1-3), along with three known ones, lobophylins A-C (4-6), were isolated from the ethyl acetate extract of the Taiwan water soft coral Lobophytum crassum. The structures of isolated cembrenoids were elucidated on the basis of extensive spectroscopic methods such as IR, 1D, 2D NMR and HR-ESI-MS.