Using COC(=O)C1CN(C(=O)OC(C)(C)C)CCC1N1C(=O)OCc2ccccc21 to produce COC(=O)C1CNCCC1N1C(=O)OCc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.