Acta Cryst. (2006). E62, o261-o263 [ doi:10.1107/S1600536805039863 ]
Abstract: The title compound, C20H10Cl2N2O2, is one of the quinacridone derivatives known as red pigments. The molecule has inversion symmetry. The quinacridone molecules are connected by N-HO hydrogen bonds along the  direction to form a ribbon structure.
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