Chemical exploration of the n-hexane extract of the flowers of Mammea siamensis led to the identification of six new compounds, deacetylmammea E/AC cyclo D (1), deacetylmammea E/AA cyclo D (2), deacetylmammea E/AB cyclo D (3), deacetylmammea E/BC cyclo D (4), deacetylmammea E/BB cyclo D (5), and deacetylmammea E/BA cyclo D (6). The structures of these compounds were elucidated by analysis of the spectral data. The absolute stereochemistry of 1, 5 and 6 were established by the modified Mosher's method.
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