Using C[Si](C)(C)CCOCn1nc2c(CO)cc(C(F)(F)F)cc2c1Br, O=C1CCC(=O)N1Br to produce C[Si](C)(C)CCOCn1nc2c(CBr)cc(C(F)(F)F)cc2c1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.