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XRPD of materials obtained from the extrusion of Theophylline and citric acid. The descriptions of samples TC1 through TC7 are provided in Table 2. (a) Samples producing the anhydrous cocrystal phase; and (b) samples producing the hydrated cocrystal. The dotted line in Figure (a) tracks the peak at 12.8° 2θ and provides information about unreacted starting material in the extruded samples.
