Using NCC(=O)OCc1ccccc1, CC(C)(C)OC(=O)N[C@H](Cc1ccccc1)C(=O)O to produce CC(C)(C)OC(=O)N[C@H](Cc1ccccc1)C(=O)NCC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.