, and a carbonyl band at 1685 cm -1 . Compound 4's 1 H NMR spectrum indicated a signal at δ 9.20 due to an amide NH proton, a doublet of doublets at δ 6.50 due to a CH proton, as well as an aromatic multiple at δ 7.22-7.48 due to phenyl protons. Additionally, a molecular ion peak at m/z 295.87 (16.88%) was visible in the mass spectrum for this substance.