Simultaneous Determination of 15 Sulfonate Ester Impurities in Phentolamine Mesylate, Amlodipine Besylate, and Tosufloxacin Tosylate by LC-APCI-MS/MS

Figure 1

(a) An MS/MS spectrum of a methanesulfonate ester. (b) An MS/MS spectrum of a benzenesulfonate ester. (c) An MS/MS spectrum of a p-toluenesulfonate ester.

(a)

(b)

(c)