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