Using CC(C)(C)OC(=O)N1CCN(c2ncc(Br)n3nnnc23)CC1, OB(O)c1cccs1 to produce CC(C)(C)OC(=O)N1CCN(c2ncc(-c3cccs3)n3nnnc23)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.