Using CC(=O)c1c(-c2ccc(O)c3ccccc23)oc2ccccc12, BrCCBr to produce CC(=O)c1c(-c2ccc(OCCBr)c3ccccc23)oc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.