Using C=COCCCC, COC(=O)c1ccc2c(Br)nn(CC(=O)OC(C)(C)C)c2c1 to produce COC(=O)c1ccc2c(C(C)=O)nn(CC(=O)OC(C)(C)C)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.