Using CCCC(CC(=O)OC)n1c(=O)n(Cc2cc(Cl)cc3[nH]c(=O)oc23)c2ccccc21 to produce CCCC(CC(=O)O)n1c(=O)n(Cc2cc(Cl)cc3[nH]c(=O)oc23)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.