Using Cc1cc(C)c2oc(=O)[nH]c2c1, CC(C)(C)OC(=O)CBr to produce Cc1cc(C)c2oc(=O)n(CC(=O)OC(C)(C)C)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.