Using CC(=O)c1n[nH]c2cnc(C)cc12, CC(C)(C)OC(=O)CBr to produce CC(=O)c1nn(CC(=O)OC(C)(C)C)c2cnc(C)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.