rationally designed as β-glucuronidaseinhibitors. These designed compounds were successfully synthesized and characterized through various spectroscopic techniques such as IR, 1H-NMR, 13C-NMR, and EI-MS. A structure-activity relationship (SAR) of synthesized derivatives to inhibitβ-glucuronidase was also established. In vitro biological evaluations revealed that 4i as the most potent compound in this series