Using COC(=O)C1=C(C)NC(C)=C(C(=O)OC)C1c1cccc(Br)c1 to produce COC(=O)C1=C(C)NC2=C(C(=O)OC2)C1c1cccc(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.