Using COC=C(C(=O)OC)c1csc2ccc(C)cc12, O=C1CCC(=O)N1Br to produce COC=C(C(=O)OC)c1csc2ccc(CBr)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.