Using COC(=O)C1CN(C(=O)OC(C)(C)C)CC(=O)N1, NOP(=O)(c1ccccc1)c1ccccc1 to produce COC(=O)C1CN(C(=O)OC(C)(C)C)CC(=O)N1N, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.