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An investigation of the root bark of Bauhinia pentandra (Fabaceae) led to the isolation and characterization of the cyanoglucoside riachin (1). The structure of 1 was established from the IR, HR-ESI-MS, and NMR spectral data, including 2D NMR experiments. The absolute configuration of 1 was determined by circular dichroism spectroscopy. The extract, its various fractions, and the compound riachin...