Using CC(=O)OC(C)=O, O=C(N[C@@H]1Cc2ccc3[nH]ncc3c2CN(C2CCNCC2)C1=O)OCc1ccccc1 to produce CC(=O)N1CCC(N2Cc3c(ccc4[nH]ncc34)C[C@@H](NC(=O)OCc3ccccc3)C2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.