1: Takahashi N, Fujita Y, Takahashi N, Nakamura A, Harada T. Effect of xanthan gum-based food thickeners on the dissolution profile of fluoroquinolones oral formulations. J Pharm Health Care Sci. 2020 Nov 30;6(1):25. doi: 10.1186/s40780-020-00181-9. 2: Jin B, Guo K, Zhang T, Li T, Ma C. Simultaneous Determination of 15 Sulfonate Ester Impurities in Phentolamine Mesylate, Amlodipine Besylate, and Tosufloxacin Tosylate by LC-APCI-MS/MS. J Anal Methods Chem. 2019 Oct 7;2019:4059765. doi: 10.1155/2019/4059765. 3: Deng FY, Huang CX, Liu Y. [Mn2+-cTMAB-sensitized fluorescent microscopic determination of tosufloxacin tosylate based on a self-ordered ring]. Guang Pu Xue Yu Guang Pu Fen Xi. 2014 Feb;34(2):445-9. Chinese. 39(10):1002-5. French. 16(9):435-43. 23(4):527-35. doi: 10.1093/jac/23.4.527.