Using COc1cc(-c2nc(-c3ccc4c(CCC(=O)[O-])c[nH]c4c3)no2)cnc1OC(C)C to produce COc1cc(-c2nc(-c3ccc4c(CCC(=O)O)c[nH]c4c3)no2)cnc1OC(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.