Using CCOC(=O)c1c(O)c2cc(Cl)ccc2c(=O)n1C, O=C([O-])[O-] to produce CCOC(=O)c1c(OC)c2cc(Cl)ccc2c(=O)n1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.