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The monohydrate chloride and bromide salts of theophylline are mutually isostructural, with the cations and anions lying on crystallographic mirror planes (Z' = 1\over 2). The BF4 salt structure is based on planar hydrogen-bonded theopylline cation dimers, with the anions inter­acting with the dimers in a pendant fashion. The anhydrous chloride salt structure has Z' = 2 and forms one-dimensional chains of cations and anions propagating parallel to the crystallographic c direction.
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