Using O=C1OC(=O)c2c1cc1ccc(Cl)cc1c2-c1ccc(Cl)cc1 to produce O=C1OCc2c1cc1ccc(Cl)cc1c2-c1ccc(Cl)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.