Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.006 Å; R factor = 0.030; wR factor = 0.070; data-to-parameter ratio = 22.2.The title compound, (C 7 H 8 NO) 6 [Sb 4 Cl 18 ], contains centrosymmetric hexaanions built up from four vertex-sharing alternating SbCl 5 square-based pyramids and highly distorted SbCl 6 octahedra when long (<3.2 Å ) 'secondary' Sb-Cl interactions are taken into account. The inter-polyhedral Sb-Cl bonds define a square-shape. In the crystal, the components are linked by N-HÁ Á ÁCl, C-HÁ Á ÁCl and C-HÁ Á ÁO hydrogen bonds, generating a three-dimensional network. Table 1 Selected bond lengths (Å ).
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