Using O=C([O-])[O-], O=C(O)C(=O)c1ccccc1Nc1c(Cl)cccc1Cl to produce COC(=O)C(=O)c1ccccc1Nc1c(Cl)cccc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.