peak at r ≈ 1.0 Å, corresponding to the covalent OH bond of carbamic acid. While both FPMD and DPMD predict a fast chemical equilibrium of carbamate and carbamic acid in NH 3 solution, DPMD slightly overestimates the stability of carbamic acid relative to FPMD, thus the higher intensity of the OH g(r) at r ≈ 1.0 Å. Overall, the DNN potential accurately reproduces the first-principles structure of both liquid ammonia and CO 2 chemically bound in this liquid, but at orders of magnitude lower computational cost.