Using BrC(Br)(Br)Br, Nc1ncnn2c(CCO)cc(-c3ccc4cn(Cc5ccccc5)nc4c3)c12 to produce Nc1ncnn2c(CCBr)cc(-c3ccc4cn(Cc5ccccc5)nc4c3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.