Using Brc1ccnc(Br)n1, O=c1[nH]c2ncccc2n1C1CCNCC1 to produce O=c1[nH]c2ncccc2n1C1CCN(c2ccnc(Br)n2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.