Using CCCc1c2c(c(O)c3c(=O)cc(C(=O)O)oc13)CCCC2 to produce CCCc1c2c(c(O)c3c(=O)cc(C(=O)[O-])oc13)CCCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.