Using O=C1CCCc2nc(N3CCN(Cc4ccccc4)CC3)ncc2N1, CCBr to produce CCN1C(=O)CCCc2nc(N3CCN(Cc4ccccc4)CC3)ncc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.