Using CC(C)(C)OC(=O)CN1CCCN(C2CCN(C(=O)OCc3ccccc3)CC2)C1=O to produce O=C(OCc1ccccc1)N1CCC(N2CCCN(CCO)C2=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.