text: Crystal data
  C16H20N4
  M r = 268.36
  Monoclinic, 
  a = 12.819 (4) A
  b = 8.441 (3) A
  c = 13.310 (4) A
  beta = 95.462 (5)degrees
  V = 1433.7 (8) A3
  Z = 4
  Mo Kalpha radiation
  mu = 0.08 mm-1
  T = 298 (2) K
  0.33 x 0.28 x 0.21 mm
  