In the title mol-ecular salt, CHNO·Cl, two of the C-C-N-O groups in the cation adopt a conformation [torsion angles = 62.86 (11) and -54.95 (13)°] and one an conformation [-177.82 (10)°. The cation and anion are linked by an O-H⋯Cl hydrogen bond. The extended structure displays C-H⋯Cl and C-H⋯O hydrogen bonds, resulting in layers lying parallel to the (100) plane: further C-H⋯Cl contacts connect the sheets into a three-dimensional network.
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