CCC1C(=O)N(c2cncc3ccccc23)C(=O)C12CN(CC(=O)NC)Cc1ccc(Cl)cc12
CCC1C(=O)N(c2cncc3ccccc23)C(=O)C12CN(CC(=O)NC)C(=O)c1ccc(Cl)cc12
CCC1C(=O)N(c2cncc3ccccc23)C(=O)C12CN(S(=O)(=O)CC1(C#N)CC1)Cc1ccc(Cl)cc12
CCC1C(=O)N(c2cncc3ccccc23)C(=O)C12CN(C1(C(=O)NC)CC1)Cc1ccc(Cl)cc12
just in case if it turns out that that sp3 carbon cannot be replaced by nitrogen after all (probably generates additional problems, like racemization)