Using O=C(O)c1cnc2c(Cl)nn(Cc3c(Cl)cccc3Cl)c2c1 to produce O=C([O-])c1cnc2c(Cl)nn(Cc3c(Cl)cccc3Cl)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.