Using CCCCCOc1c(OC)ccc2cc(C(=O)OC)c(=O)[nH]c12 to produce CCCCCOc1c(OC)ccc2cc(C(=O)O)c(=O)[nH]c12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.