Using OCCCBr, COc1cc2ncnc(Oc3ccc4[nH]c(C)cc4c3F)c2cc1O to produce COc1cc2ncnc(Oc3ccc4[nH]c(C)cc4c3F)c2cc1OCCCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.