Using CCOC(=O)c1nc2c(s1)C(CC)COc1cc(F)c(Br)cc1-2 to produce O=C(O)c1nc2c(s1)CCOc1cc(F)c(Br)cc1-2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.