Using COC(=O)C(C)(C)[C@H]1CC[C@H](c2ccc(NC(=O)c3nnc(Nc4cc(F)c(F)cc4F)o3)cc2)CC1 to produce CC(C)(C(=O)O)[C@H]1CC[C@H](c2ccc(NC(=O)c3nnc(Nc4cc(F)c(F)cc4F)o3)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.