O=C(Cc1cc(Cl)cc(CC2CC(=O)N2)c1)Nc1cncc2ccccc12
Cc1c(CC(=O)Nc2cncc3ccccc23)cc(Cl)cc1OC1CC(=O)N1
COc1c(CC(=O)Nc2cncc3ccccc23)cc(Cl)cc1CC1CC(=O)N1
O linked lactams with ortho substituent designs to stabilised the out of plane conformation as seen in crystal structure Mpro-10789. C linked lactams designed to prefer out of plane conformation and to be more metabolically stable.