Using Oc1cc(Br)cc(CNc2nc(Nc3cccc(CCCBr)c3)ncc2Cl)c1 to produce Clc1cnc2nc1NCc1cc(Br)cc(c1)OCCCc1cccc(c1)N2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.