Using O=C(O)CCC1CCN(C(=O)c2ccccc2)CC1, COC(=O)N1CCc2ccccc2CC1 to produce COC(=O)N1CCc2ccc(C(=O)CCC3CCN(C(=O)c4ccccc4)CC3)cc2CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.