Acta Cryst. (2014). C70, 323-325 [ doi:10.1107/S2053229614002447 ]
Synopsis: The first noncentrosymmetric polymorph of 4-aminobenzoic acid (PABA) is described. The two crystallographically independent PABA molecules form pseudocentrosymmetric O-HO hydrogen-bonded dimers that are further linked by N-HO hydrogen bonds into a three-dimensional network.
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