Using CS(=O)(=O)OCCCc1cc(Cl)cc2nc(Cc3ccccc3Cl)oc12, C[O-] to produce COCCCc1cc(Cl)cc2nc(Cc3ccccc3Cl)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.