Using O=[Cr](=O)([O-])Cl, O=C(Cc1ccc(Cl)cc1)c1ccc(Cl)cc1Cl to produce O=C(C(=O)c1ccc(Cl)cc1Cl)c1ccc(Cl)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.