Using COc1ccc(O)c(C(=O)Nc2cc(-c3ccco3)ccc2C(=O)O)c1 to produce COc1ccc(O)c(C(=O)Nc2cc(-c3ccco3)ccc2C(=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.