Using CCCCCCCCCCCCCCCCCC(=O)c1c[nH]c2cc(C(=O)OC)ccc12 to produce CCCCCCCCCCCCCCCCCC(=O)c1c[nH]c2cc(C(=O)O)ccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.