Using CCCCc1nc2ccccc2n1Cc1ccc(OCCC2CCCCC2C(=O)OC)cc1 to produce CCCCc1nc2ccccc2n1Cc1ccc(OCCC2CCCCC2C(=O)O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.