Using CCOC(=O)c1nn(CC(=O)Nc2ccc(Cl)cn2)c(C(=O)OCC)c1OCC(F)(F)F to produce CCOC(=O)c1nn(CC(=O)Nc2ccc(Cl)cn2)c(C(=O)O)c1OCC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.