title: Pimobendan B from powder diffraction data.
abstract: The title mol-ecule, C19H18N4O2 {systematic name: (RS)-6-[2-(4-meth-oxy-phen-yl)-1H-benzimidazol-5-yl]-5-methyl-4,5-di-hydro-pyridazin-3(2H)-one}, adopts an extended conformation. The dihedral angles between the central benzimidazole ring sytem and the pendant meth-oxy-phenyl 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 supra-molecular structure parallel to (010). The layers are linked by C-H⋯π inter-actions.
authors: University of Latvia, Department of Chemistry, Kr. Valdemara Street 48, Riga, LV-1013, Latvia.
authors: Alvis
authors: A
authors: Zvirgzdins
authors: University of Latvia, Department of Chemistry, Kr. Valdemara Street 48, Riga, LV-1013, Latvia.
authors: Mara
authors: M
authors: Delina
authors: Latvian Institute of Organic Synthesis, Aizkraukles Street 21, Riga, LV-1006, Latvia.
authors: Anatoly
authors: A
authors: Mishnev
authors: University of Latvia, Department of Chemistry, Kr. Valdemara Street 48, Riga, LV-1013, Latvia.
authors: Andris
authors: A
authors: Actins