Using O=C(OCc1ccccc1)ON1C(=O)CCC1=O, CC(C)(C)OC(=O)N1CCC(N)(C(=O)O)CC1 to produce CC(C)(C)OC(=O)N1CCC(NC(=O)OCc2ccccc2)(C(=O)O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.