Using CN1CCC(=C2c3ccccc3C(Br)C(Br)c3ccccc32)CC1 to produce CN1CCC(=C2c3ccccc3C=C(Br)c3ccccc32)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.