Using BrBr, Nc1nc(Nc2ccccc2)nc2c1ncn2Cc1ccccc1 to produce Nc1nc(Nc2ccccc2)nc2c1nc(Br)n2Cc1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.