Using COc1ccc(N2CCNCC2)cc1, O=C(O)CC1CCc2ccccc21 to produce COc1ccc(N2CCN(C(=O)CC3CCc4ccccc43)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.