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Inhibition of the uptake of 3H-thymidine into TLX-5 mouse lymphoma cells has been used to assess the cytotoxicity of extracts and fractions of Brucea jayanica. Six bruceolides, two dehydrobruceolides and a dihydrobruceolide have been isolated from roots, fruits and stems. Bruceine A was the major bruceo-lide of the roots and of the fruits. The 210 Phillipson, Darwish cation of these nine compounds by means of their UV, ElMS, CIMS, FDMS and 'H NMR spectra is discussed. bruceolides which have been reported from some of these species:-B. javanica: The first bruceolides to be completely characterised were bruceines A (2), B (3) and C (4) from material iden

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