Using CC[Si](CC)(CC)c1cc(Br)cc2c1OC(F)(F)O2, O=C=O to produce CC[Si](CC)(CC)c1cc(C(=O)O)cc2c1OC(F)(F)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.