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Chromatographic fractionation of the hexane extract from the wood of Ouratea floribunda (Ochnaceae) afforded friedelin (1), friedelanol (2), lupeol (3) and the depside atranorin (4). The structure elucidation of the isolated compounds was performed by spectrometric analysis involving comparison with literature data. The unambiguous assignments of 1H and 13C NMR data of atranorin 4 and its acetyl derivative 4a are reported for the first time and involved 1H-1H homonuclear (COSY and NOESY) and 1H-13C heteronuclear (HMQC and HMBC) NMR experiments.

Chemical constituents from Ouratea floribunda: complete¹H and 13C NMR assignments of atranorin and its new acetyl derivative