A series of chalcones (1-9) and pyrazoles (10-18) was prepared to investigate their potential activity as Angiotensin I-Converting Enzyme (ACE) inhibitors. Their structures were verified by elemental analysis, UV, IR, MS, (1)H NMR, (13)C NMR, and 2D NMR experiments. Among tested compounds, chalcone 7 exerted the highest activity with an IC(50) value of 0.219 mM, while the most potent pyrazole was 15 (IC(50) value of 0.213 mM).
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