Using CC(C)(C)OC(=O)N1CCN(c2ccc(Nc3ncc(Br)n4ncnc34)cc2)C(=O)C1 to produce O=C1CNCCN1c1ccc(Nc2ncc(Br)n3ncnc23)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.