Using CCc1nn(Cc2c(Cl)cccc2Cl)c2cc(CC(=O)O)ccc12 to produce CCc1nn(Cc2c(Cl)cccc2Cl)c2cc(CC(=O)[O-])ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.