Using O=C([O-])[O-], CCOC(=O)c1cccc2c1C(=O)C(c1ncnn1C)C(c1ccc(F)cc1)N2 to produce CCOC(=O)c1cccc2c1C(=O)C(C)(c1ncnn1C)C(c1ccc(F)cc1)N2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.