Two new flavanones, (2S)-5-hydroxy-7,4′-di-O-(γ,γ-dimethylallyl)flavanone (1) and 6-hydroxy-E-3-(2,5-dimethoxy-benzylidine)-2′,5′-dimethoxyflavanone (2), together with three known compounds, tephrowatsin C, afrormosin and kaempferol 3-O-β-D-glucopyranoside were isolated from the roots of Tephrosia calophylla. The structures of 1 and 2 were established by extensive 2D NMR spectral studies.
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