Using CCCc1ccccc1OCCCOc1ccc2c(=O)cc(C(=O)O)oc2c1 to produce CCCc1ccccc1OCCCOc1ccc2c(=O)cc(C(=O)[O-])oc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.