Using CC(C)(C)OC(=O)CN1C(=O)C2(CCC(=O)CC2)c2ccccc21 to produce O=C(O)CN1C(=O)C2(CCC(=O)CC2)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.