Abstract
The n-hexane and carbon tetrachloride soluble fractions of a methanolic extract of the stem bark of the Couroupita guianensis furnished three compounds, identified as <TEX>$\beta$</TEX>-amyrin (1), betulin-<TEX>$3{\beta}$</TEX>-caffeate (2) and lupeol-<TEX>$3{\beta}$</TEX>-caffeate (3). The structures of the isolated compounds were deduced by extensive spectroscopic analysis as well as by comparison with published values. Compounds 1-3 were subjected to antioxidant screening through free radical scavenging activity by DPPH (1,1-diphenyl-2-picrylhydrazyl), where compound 2 showed moderate antioxidant activity with <TEX>$IC_{50}$</TEX> value <TEX>$108.0{\mu}g/ml$</TEX>.
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