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Comparison of the crystal structures and thermochemistry of a novel soluble guanylate cyclase stimulator riociguat and its solvates.
Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials 2017 October 2
Riociguat (Rio) is the first oral soluble guanylate cyclase stimulator to be approved for pulmonary arterial hypertension. In this study, form (II) of riociguat and three solvates with acetonitrile [form (III)], N,N-dimethylformamide [form (IV)] and ethyl acetate [form (V)] were crystallized. They were identified and characterized by differential scanning calorimetry, thermogravimetric analysis, X-ray powder diffraction, and their crystal structures were determined by single-crystal X-ray diffraction. No crystal structure has previously been reported for the known form (II) of riociguat. Crystal structure determination of Rio and its new solvates revealed that the dimeric R2 2 (14) motif is common in both structures. The crystal packing of solvates adopts channel-like patterns, whereas form (II) of riociguat adopts sheet-like patterns. Strong π-π interactions exist in the above four forms. The conformation of the riociguat in one molecule of 0.5-DMF solvate was found to be significantly different from the conformations found in the other solvates. Desolvation of the three solvates was studied by thermogravimetric analysis and X-ray diffraction, and was shown to transform them into form (I) of riociguat.
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