Using COC(=O)Cc1c[nH]c2c(Cl)ncc(Br)c12, CC(C)(C)OC(=O)CBr to produce COC(=O)Cc1cn(CC(=O)OC(C)(C)C)c2c(Cl)ncc(Br)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.