Using CCCc1c(CCCCCCOc2ccccc2CCC(=O)OC)ccc2c1OCCC2=O to produce CCCc1c(CCCCCCOc2ccccc2CCC(=O)O)ccc2c1OCCC2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.