Using C=Cc1ccc2c(c1)Cc1ccccc1-2, BrCCC1c2ccccc2-c2ccccc21 to produce C=Cc1ccc2c(c1C1(CC)c3ccccc3-c3ccccc31)Cc1ccccc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.