Using CC(C)=CCCC(C)=CCCC(C)=CCBr, COC(=O)CC(C)=O to produce COC(=O)CC(=O)CCC=C(C)CCC=C(C)CCC=C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.