Using CC1(C)OB(c2ccnc(N3CCOCC3)c2)OC1(C)C, Nc1ccc(-c2nc(Br)cnc2N)cc1 to produce Nc1ccc(-c2nc(-c3ccnc(N4CCOCC4)c3)cnc2N)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.