Using O=C([O-])[O-], CCOC(=O)c1cn(NC=O)c2c(OC)c(F)c(F)cc2c1=O to produce CCOC(=O)c1cn(NCC=O)c2c(OC)c(F)c(F)cc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.