Salt formation by crystallization. 1 mmol of TBZ and each co-former were dissolved in the lowest amount of ethanol: methanol: water, 1:1:1. The solutions were kept undisturbed to slowly evaporate at room temperature for one month. The TBZ salts with HSAC, H2MA, and H2OX (Due to its effect on the kidney, oxalic acid is not a favorable conformer.) gave single crystals suitable for SC-XRD analyses. The TBZ salts with H2FU gave twined microcrystals. PXRD measurements confirmed the salt formation and phase purity for the samples.