%0 Journal Article %T Phthalimide derivatives as a new class of papain‐like protease inhibitors in SARS‐CoV‐2 %V 358 %N 1 %P e2400714 %U https://onlinelibrary.wiley.com/doi/10.1002/ardp.202400714 %X Abstract The severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) papain‐like cysteine protease (PLpro) represents one of only two essential cysteine proteases involved in the regulation of viral replication. It, therefore, qualifies as a promising therapeutic target for the development of antiviral agents. We identified a previously synthesized protease inhibitor, resulting from an earlier project, as a PLpro inhibitor and crafted a structure–activity relationship around the hit, leading to the more potent inhibitors ZHAWOC6941 ( 17h ) and ZHAWOC25153 ( 17o ) displaying IC 50 values of 8 and 7 µM, respectively. The two compounds represent a new class of PLpro inhibitors and, with single‐digit micromolar IC 50 values, are comparable to inhibitors found in the literature. %G en %J Archiv der Pharmazie %A Fischer, Thomas %A Frasson, David %A Sievers, Martin %A Riedl, Rainer %D 01/2025