Using NNc1cc(C2CNCCN2Cc2ccccc2)nc(C2CNCCN2Cc2ccccc2)n1 to produce Nc1cc(C2CNCCN2Cc2ccccc2)nc(C2CNCCN2Cc2ccccc2)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.