Using CN1C(=O)c2cccnc2Nc2ccccc21, BrCc1ccccc1 to produce CN1C(=O)c2cccnc2N(Cc2ccccc2)c2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.