Using O=C(O)c1cc2c(ncn2-c2cccc(-c3ccsc3)c2)[nH]1, O=C([O-])O to produce COC(=O)c1cc2c(ncn2-c2cccc(-c3ccsc3)c2)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.