Using CCOC(=O)c1nc(Br)c2snc(-c3ccccc3)c2c1O, OB(O)c1ccc(F)cc1 to produce CCOC(=O)c1nc(-c2ccc(F)cc2)c2snc(-c3ccccc3)c2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.