Using COc1ccc2c(CBr)nn(OC(=O)OC(C)(C)C)c2c1, [C-]#N to produce COc1ccc2c(CC#N)nn(OC(=O)OC(C)(C)C)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.