Using CCOC(=O)c1cc(CBr)nc(C(F)(F)F)n1, CC(=O)[O-] to produce CCOC(=O)c1cc(COC(C)=O)nc(C(F)(F)F)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.