Using O=C1OC(=O)c2cc(Cl)c(Cl)cc21, COC(=O)CCCCc1ccc(O)c(Cl)c1O to produce COC(=O)CCCCc1cc(C(=O)c2cc(Cl)c(Cl)cc2C(=O)O)c(O)c(Cl)c1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.