Oblongifolins A-D (2-5), four new polyprenylated 3,4-dihydroxybenzoylphloroglucinol compounds, were isolated from the bark of Garcinia oblongifolia collected in Vietnam. The bark was also found to contain the known compounds camboginol and guttiferone B. Extraction of the leaves gave 2 and camboginol. Details of the structure elucidation of 2-5 and stereochemical comparisons with known natural derivatives of general formula 1a,b are presented. The biological activity of these compounds concerning interactions with tubulin was investigated.

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A series of N-omega-aminoalkyl- or N-omega-amidinoalkyl-2,4,6-triisopropyl benzenesulfonamides has been synthesized and their respective affinity indices on 5-HT6 receptor determined. This evaluation clearly showed that the compounds possessing an arylpiperazine moiety or an amidine function exhibited good affinity for the model.