Using CC(C)(C)OC(=O)N[C@@H](COCc1ccccc1)C(=O)O, NC(=O)[C@H](N)CCC(=O)OCc1ccccc1 to produce CC(C)(C)OC(=O)N[C@@H](COCc1ccccc1)C(=O)N[C@H](CCC(=O)OCc1ccccc1)C(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.