A SciFinder n search (conducted March 2024) returned 178 citations of the previously accepted triethylamine-sulfur trioxide complex but only 7 references to a betaine structure for the complex but not based on any new structural insights. Intriguingly, Savel'yanov reported that the related structure of sulfamic acid (NH2SO3H) is a zwitterion (NH3 + SO3 -) based on reaction kinetics experiments and inferred the structure of trimethylamine-sulfur trioxide would be analogous. This compares favourably with related reports to the dielectric properties, gas phase study of dipole moments, . and mechanistic studies. Within the field of ionic liquids, for a related scaffold (N,N-diethyl-N-sulfoethanaminium hydrogen sulfate) a formal bond between the N and S was proposed based on FT-IR, 1 H and 13 C NMR spectroscopy and mass spectrum data. Taken, together this gives further confidence on our structural reassignment for triethylsulfoammonium betaine [TESAB] (previously triethylamine-sulfur trioxide complex) with the first single crystal X-ray crystallography reported herein. Furthermore, a search for "any" chemical transformation involving triethylamine-sulfur trioxide complex, returned 43,376 examples but merely two examples for an oxidation reaction. Oxidation chemistry with the analogous trimethylamine-sulfur trioxide complex revealed a single report. In comparison, for a traditional pyridine-sulfur trioxide oxidation reaction there are 369,630 transformations reported of which there are 636 citations specifically employing a Parikh-Doering oxidation.