Y. Kageyama et al., STRUCTURE OF THE PHOTOSTABLE FORM OF P-NITROCINNAMIC ACID, Acta crystallographica. Section C, Crystal structure communications, 49, 1993, pp. 833-834
The molecule is planar to within 0.08 (2) angstrom. The molecules form
a centrosymmetric dimer through O-H...O hydrogen bonds between the ca
rboxylic groups. The dimers are stacked along b with an interplanar di
stance of 3.374 (2) angstrom. The C=C double bonds of the nearest neig
hbors are related by a b translation.