Using OO, COCCOCC(CC1(C(C)=O)CCCCC1=O)C(=O)OC(C)(C)C to produce COCCOCC(CC1(C(=O)O)CCCC1)C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.