Using NCc1cccnc1, O=C(O)c1ccc(Nc2ncc(Br)n3ncnc23)cc1 to produce O=C(NCc1cccnc1)c1ccc(Nc2ncc(Br)n3ncnc23)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.