Using Cc1cccc(C)c1C(=O)OCC(=O)C(CC(=O)OC(C)(C)C)NC(=O)OCc1ccccc1 to produce Cc1cccc(C)c1C(=O)OCC(=O)C(N)CC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.