Using C1COCCO1, O=C(O)c1cc(Cl)c(Cl)cc1-c1nc2ccsc2c(=O)[nH]1 to produce COC(=O)c1cc(Cl)c(Cl)cc1-c1nc2ccsc2c(=O)[nH]1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.