Using COCCl, CCOC(=O)Nc1c(F)cc(F)c(O)c1C(=O)OCC to produce CCOC(=O)Nc1c(F)cc(F)c(OCOC)c1C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.