Using OB(O)c1ccccc1C(F)(F)F, CCOC(=O)c1[nH]c(C)c(Br)c1C to produce CCOC(=O)c1[nH]c(C)c(-c2ccccc2C(F)(F)F)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.