O=C(Nc1cncc2ccccc12)C1NCCc2ccc(Cl)cc21
CC1(C(=O)Nc2cncc3ccccc23)NCCc2ccc(Cl)cc21
CN1CCc2ccc(Cl)cc2C1C(=O)Nc1cncc2ccccc12
O=C(Nc1cncc2ccccc12)C1c2cc(Cl)ccc2CCN1CC1CC1
Amino acid buidling block is widely available, might be a promising benzopyran replacment