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