Using BrBr, Cc1ccc(C2c3c(C)cc(C)c(C)c3OC2(C)C)cc1 to produce Cc1ccc(C2c3c(C)c(Br)c(C)c(C)c3OC2(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.