Using BrCCBr, N#Cc1cnc2cc(N)c(O)cc2c1Nc1ccc(Cl)cc1Cl to produce N#Cc1cnc2cc3c(cc2c1Nc1ccc(Cl)cc1Cl)OCCN3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.