Using CC(=O)c1ccc(Cl)nc1NC(=O)C(C)(C)C, CC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)CC(C)(O)c1ccc(Cl)nc1NC(=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.