Using CN1C(=O)c2cccnc2Nc2ccccc21, CC(C)(C)OC(=O)CBr to produce CN1C(=O)c2cccnc2N(CC(=O)OC(C)(C)C)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.