Acta Cryst. (2013). E69, o91
[ doi:10.1107/S1600536812050258 ]

(E)-2-Hydroxy-4-methoxy-3-(3-methylbut-2-enyl)-6-styrylbenzoic acid

X. Ji, J. Jin, G. Zheng and Z. Li

Abstract: The title compound, C₂₁H₂₂O₄, also known as cajanine, features an intramolecular O-HO hydrogen bond between the adjacent carboxy and hydroxy groups. The benzene rings make an interplanar angle of 175.4 (2)°. In the crystal, molecules are linked by pairs of O-HO hydrogen bonds, forming inversion dimers.

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