Using O=C1NC(=O)c2cc([N+](=O)[O-])ccc21, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)CN1C(=O)c2ccc([N+](=O)[O-])cc2C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.