Using CCCCSCC(O)COc1cccc2oc(C(=O)O)cc(=O)c12 to produce CCCCSCC(O)COc1cccc2oc(C(=O)[O-])cc(=O)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.