Using OCCO, O=C1OC(=O)c2c(Cl)c(Cl)c(Cl)c(Cl)c21 to produce O=C(O)c1c(Cl)c(Cl)c(Cl)c(Cl)c1C(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.