Using CCOC(=O)C(C(=O)OCC)C(c1ccccc1)c1ccc(NC(=O)OC(C)(C)C)nc1 to produce CCOC(=O)C(C(=O)O)C(c1ccccc1)c1ccc(NC(=O)OC(C)(C)C)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.