Using CCOC(=O)CCN1Cn2cc(C(=O)OCC)cc2-c2ccccc21 to produce O=C(O)CCN1Cn2cc(C(=O)O)cc2-c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.