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Acta Cryst. (2013). E69, o1677
[ doi:10.1107/S1600536813028353 ]

Pimobendan B from powder diffraction data

A. Zvirgzdins, M. Delina, A. Mishnev and A. Actins

Abstract: The title mol­ecule, C19H18N4O2 {systematic name: (RS)-6-[2-(4-meth­oxy­phen­yl)-1H-benzimidazol-5-yl]-5-methyl-4,5-di­hydro­pyridazin-3(2H)-one}, adopts an extended conformation. The dihedral angles between the central benzimidazole ring sytem and the pendant meth­oxy­phenyl and pyridazinone residues are 1.41 (18) and 9.7 (3)°, respectively. In the crystal, N-H...N hydrogen bonds link the imadazole groups into [001] chains, and pairs of N-H...O hydrogen bonds link the pyridazinone groups into dimers. Together, these generate a two-dimensional supra­molecular structure parallel to (010). The layers are linked by C-H...[pi] inter­actions.

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