Using OO, COc1ccc(COC(=O)CCC2(C(=O)c3ccccc3)CCCCC2=O)cc1 to produce COc1ccc(COC(=O)CCC2(C(=O)O)CCCC2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.