Using O=c1[nH]nc(-c2c[nH]c3ccccc23)n1-c1cn(CCCO)c2ccc(F)cc12, BrC(Br)(Br)Br to produce O=c1[nH]nc(-c2c[nH]c3ccccc23)n1-c1cn(CCCBr)c2ccc(F)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.