Using Nc1ccc(Nc2ccc(Nc3ccc(Nc4ccccc4)cc3)cc2)cc1 to produce Nc1ccc(Nc2ccc(Nc3ccc(N)cc3)cc2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.