O=C(Cc1cncc2ccccc12)NCc1cccc(Cl)c1
CNc1cc(Cl)cc(CNC(=O)Cc2cncc3ccccc23)c1
CNc1cc(Cl)cc(CN(C(=O)Cc2cncc3ccccc23)C2CCN(C(C)=O)CC2)c1
CC(=O)N1CCC(N(Cc2cccc(Cl)c2)C(=O)Cc2cncc3ccccc23)CC1
O=C(Cc1cncc2ccccc12)N(CCN1CCOCC1)Cc1cccc(Cl)c1
CNc1cc(Cl)cc(CN(CCN2CCOCC2)C(=O)Cc2cncc3ccccc23)c1
O=C(Cc1cncc2ccccc12)NCc1cc(Cl)ccc1Cl
O=C(Cc1cncc2ccccc12)NCc1cc(Cl)ccc1F
O=C(Cc1cncc2ccccc12)NCc1ccc(Cl)c(Cl)c1
O=C(Cc1cncc2ccccc12)NC1CCNc2ccc(Cl)cc21
O=C(Cc1cncc2ccccc12)NC1CNCc2ccc(Cl)cc21
CC(C)(C)Nc1cc(Cl)cc(CNC(=O)Cc2cncc3ccccc23)c1
Modification of amide linker gives better access to S4 and S1' https://fragalysis.diamond.ac.uk/viewer/react/preview/direct/target/Mpro/mols/MAT-POS-6c284e65-1/L/P/C. Aniline introduces interaction with Gln189 backbone carbonyl.