Using Oc1cccc(Nc2ncc(-c3ccc(OC(F)F)cc3)cn2)c1, OCCBr to produce OCCOc1cccc(Nc2ncc(-c3ccc(OC(F)F)cc3)cn2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.