Using O=C(Cn1c(-c2ccccc2)nc(Br)c1Br)N1CCN(c2ncccn2)CC1 to produce O=C(Cn1cc(Br)nc1-c1ccccc1)N1CCN(c2ncccn2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.