Using Oc1cc(Cl)c(Cl)cc1Cl, CCCCCCCCCCCCC(=O)O to produce CCCCCCCCCCCCC(=O)Oc1cc(Cl)c(Cl)cc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.