The examination of the 1 H NMR spectrum for compound (2) elucidates the presence of two distinctive doublets. One is discerned at 6.24 ppm, indicative of the alpha (α) proton proximate to the carbonyl CO, while the other is observed at 7. Notably, the chemical shift of NH is reduced in the CDCl3 spectrum compared to the DMSO-d6 spectrum. This observation aligns with the findings reported by Palla et al. , suggesting that the marginal chemical shifts observed in the CDCl3 spectra may be attributed to intramolecular hydrogen bonding.