Figure 2. The equilibrium forms of aspartame, where the acid group (-COOH) and the amine group (-NH2) are neutral (B), protonated (A) or deprotonated (C)

From

A Complete Structure Investigation of an Organic Molecule for Chemistry Students; An Analysis of Aspartame

Marit Kristin Leiren, Kari Grete Nordli Børve, Rhiannon Tveiten Lewis, Signe Steinkopf

American Journal of Educational Research. 2026, 14(8), 248-256 doi:10.12691/education-14-8-1