The structure of ebastinium hydrogen fumarate {systematic name: 1-[4-(4--butyl-phen-yl)-4-oxobut-yl]-4-(di-phenyl-meth-oxy)piperidin-1-ium ()-3-carb-oxy-1-hy-droxy-prop-2-en-1-olate}, CHNO ·CHO , a 1:1 salt formed in the reaction between ebastine and fumaric acid is presented. All examined crystals were found to be twinned by pseudo-merohedry. The structure is extensively disordered, with over half (20 out of 35) its non-hydrogen atoms modelled as lying over two sets of sites. In the crystal, cation-anion pairs are linked by a strong N-H⋯O hydrogen bond [N⋯O = 2.697 (11) Å]. These units inter-act weaker C-H⋯O and C-H⋯π contacts to form layers lying parallel to the plane. The hydrogen fumarate anions are linked by a very short O-H⋯O hydrogen bond [O⋯O = 2.5402 (17) Å], augmented by weak C-H⋯O contacts into pairs of (6) ring motifs to form chains that extend parallel to the -axis direction. Comparisons to similar crystal structures are presented.
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| http://dx.doi.org/10.1107/S2056989022008118 | DOI Listing |
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