Using O=Cc1ccc(OCc2ccccc2)cc1OCc1ccccc1, BrC(Br)(Br)Br to produce BrC(Br)=Cc1ccc(OCc2ccccc2)cc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.