Using CCOC(=O)C(C)(C)Sc1nc(CCOCc2ccc(Br)cc2)cs1, OB(O)Oc1ccc(F)cc1 to produce CCOC(=O)C(C)(C)Sc1nc(CCOCc2ccc(-c3ccc(F)cc3)cc2)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.