Using CC(C)(C)OC(=O)NC(=O)OC(C)(C)C, COc1ccc(Br)c(CBr)c1 to produce COc1ccc(Br)c(CN(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.