Using O=C([O-])O, COC(=O)N1CCN(c2ccc(N3CC(CNC(C)=O)OC3=O)cc2F)CC1 to produce CCOC(=O)N1CCN(c2ccc(N3CC(CNC(C)=O)OC3=O)cc2F)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.