CO 2 adsorption in condensed phase amines involves a complex chemical reaction with both charge and proton transfer events. The progress of such chemical reaction and the relative stability of reactants and products were here computed using deep neural network potentials in conjunction with enhanced sampling techniques in molecular dynamics. The free energy surface of CO 2 binding in liquid ammonia is given in Fig. , and the four separate wells of the colormap are associated to (A) free CO 2 , (B) zwitterion, (C) ammonium carbamate and the (D) carbamic acid.