Using Cc1cc(C)c2[nH]c(=O)n(CC(=O)OC(C)(C)C)c2c1, COC(=O)CBr to produce COC(=O)Cn1c(=O)n(CC(=O)OC(C)(C)C)c2cc(C)cc(C)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.