The crystal structure of the yellow pigment 2,5-dihydroxybenzo[ de ]benzo[4,5]imidazo[2,1- a ]isoquinolin-7-one (C 18 H 10 N 2 O 3 ) was determined from powder data. The crystal structure was solved by minimizing the intermolecular energy starting from random packings. Subsequently, the structure was refined by rigid-body Rietveld analysis, using synchrotron powder data. The refinement included several intramolecular degrees of freedom. The compound crystallizes in Pna 2 1 , Z \,=\,4, with lattice parameters a \,=\,13.2759 (3), b \,=\,20.9561 (5), c \,=\,4.7798 (1) Å, and V \,=\,1329.79 (5) Å 3 . The crystal consists of planar molecules, connected by hydrogen bonds of the types O–H...OH and O–H...N, which form a three-dimensional hydrogen-bond network.
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Schmidt et al. (1999) studied this question.