Using CC(=O)NCCC1CCc2ccc(N)c(O)c21, O=C(Cl)c1ccccc1 to produce CC(=O)NCCC1CCc2ccc(NC(=O)c3ccccc3)c(O)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.