Using Cc1nc(CN(C)C(=O)OC(C)(C)C)n[nH]1, O=C(CBr)OCc1ccccc1 to produce Cc1nc(CN(C)C(=O)OC(C)(C)C)nn1CC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.