Using CC(C)(O)Cn1ccc(N)n1, O=C(O)[C@H](CC1CCCC1)N1CC2=C(Oc3ccccc3C2)C1=O to produce CC(C)(O)Cn1ccc(NC(=O)[C@H](CC2CCCC2)N2CC3=C(Oc4ccccc4C3)C2=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.