Using CCCc1c(O)ccc(C(C)=O)c1O, CCOC(=O)C(=O)OCC to produce CCCc1c(O)ccc2c(=O)cc(C(=O)OCC)oc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.