3,5-Dinitrocinnamic acid adopts an unusual crystal structure wherein C–H ⋯ O hydrogen bonds dictate the symmetry of the O–H ⋯ O network while its 1 : 1 molecular complex with 2, 5-dimethoxycinnamic acid is photoreactive in the solid state to yield an unsymmetrical cyclobutane dimer.
G. R. Desiraju and C. V. K. M. Sharma, J. Chem. Soc., Chem. Commun., 1991, 1239 DOI: 10.1039/C39910001239
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