Using COC(=O)c1cnc(Br)c(-c2ccc(F)cc2)n1, OCC1CC1 to produce O=C(O)c1cnc(OCC2CC2)c(-c2ccc(F)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.