Allopurinol

Mass

MS-NW-3779          
pyrazolo(3,4-d)pyrimidin-4-ol
C5H4N4O             (Mass of molecular ion:    136)

   Source Temperature: 220 °C
   Sample Temperature: 150 °C
   Direct, 75 eV

      18.0       2.6
      27.0       2.4
      28.0      17.0
      29.0      17.2
      37.0       1.5
      38.0       3.2
      39.0       3.1
      40.0       1.4
      42.0       1.3
      43.0       4.2
      51.0       4.6
      52.0      19.3
      53.0       6.8
      54.0       1.8
      55.0       1.0
      64.0       1.1
      65.0       1.1
      66.0       1.0
      67.0       4.5
      68.0       2.9
      79.0       1.9
      80.0       2.5
      81.0       1.6
      94.0       1.5
     109.0       6.0
     120.0       2.1
     135.0      11.1
     136.0     100.0
     137.0       7.0