Fig. 4

The optimized molecular structure (drawn by Biovia, material studio Dmol3, 2022( and σ-profile of (a) Betaine, (b) urea, (c) Betaine octyl ester chloride, (d) Gabapentin, and (e) the sigma profile plot obtained from Dmol3 and COSMO result.
The optimized molecular structure (drawn by Biovia, material studio Dmol3, 2022( and σ-profile of (a) Betaine, (b) urea, (c) Betaine octyl ester chloride, (d) Gabapentin, and (e) the sigma profile plot obtained from Dmol3 and COSMO result.