Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 1 (January 2013)

organic compounds

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-H...O 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-H...O hydrogen bonds, forming inversion dimers.

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