Using COC(=O)c1cc(OCCc2ccc(Cl)cc2Cl)cc(C(=O)OC)c1 to produce O=C(O)c1cc(OCCc2ccc(Cl)cc2Cl)cc(C(=O)O)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.