Using CC(C)C[C@H](O)C(=O)O, COC(=O)[C@@H](N)c1ccccc1 to produce COC(=O)[C@@H](NC(=O)[C@@H](O)CC(C)C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.