Using COC(=O)C1C(=O)N(CC#N)C(=O)c2ccccc21, CC(C)(C)OC(=O)CBr to produce COC(=O)C1(CC(=O)OC(C)(C)C)C(=O)N(CC#N)C(=O)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.