Using CCOC(=O)c1cc(O)c2c(c1)OCO2, OCCc1ccc(Cl)cc1Cl to produce CCOC(=O)c1cc(OCCc2ccc(Cl)cc2Cl)c2c(c1)OCO2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.