Using CCCCc1ccc(C=CC(=O)c2ccc(CCCC(=O)OC)cc2)cc1 to produce CCCCc1ccc(CCC(O)c2ccc(CCCC(=O)OC)cc2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.