Using O=C(Cl)c1c(Cl)cccc1Cl, COc1ccc(O)cc1OC1CCCC1 to produce COc1ccc(OC(=O)c2c(Cl)cccc2Cl)cc1OC1CCCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.