O=C(Cc1cc(Cl)ccc1F)Nc1cncc2ccccc12
O=C(Cc1cc(Cl)ccc1Cl)Nc1cncc2ccccc12
N#Cc1ccc(Cl)cc1CC(=O)Nc1cncc2ccccc12
These designs introduce structural modifications intended to counter metabolism of the P2 aromatic ring and they may also protect the benzylic carbon.
I believe that it it would be useful to have enzyme inhibition IC50 values readily available should metabolism of the P2 aromatic ring become an issue.