Using CCOCC, CCCc1c(OC(C)=O)ccc2c1OC(C)(CCC(=O)OCC)CC2 to produce CCCc1c(O)c(C(C)=O)cc2c1OC(C)(CCC(=O)O)CC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.