Using CC(C)(C)C(=O)CBr, CCOC(=O)c1cnc(C)[nH]c1=O to produce CCOC(=O)c1cnc(C)n(CC(=O)C(C)(C)C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.