Using BrBr, CCOC(=O)N1CCc2nc(-c3ccncn3)cc(=O)n2CC1 to produce CCOC(=O)N1CCn2c(nc(-c3ccncn3)cc2=O)C(Br)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.