Using Cn1cnc2cc(OCC(=O)O)ccc21, NCC(O)CN1CCc2ccccc2C1 to produce Cn1cnc2cc(OCC(=O)NCC(O)CN3CCc4ccccc4C3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.