Using CCCn1nnn(-c2cc(OCC(=O)OC)c(Cl)cc2Cl)c1=O to produce CCCn1nnn(-c2cc(OCC(=O)O)c(Cl)cc2Cl)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.