Isotanshinone IIA(20958-15-0) MS

Mass

MS-IW-8005          
4,4,8-trimethyl-1,2,3,4-tetrahydrophenanthro(3,2-b)furan-7,11-dione
C19H18O3            (Mass of molecular ion:    294)

   Source Temperature: 150 °C
   Sample Temperature: 130 °C
   Direct, 75 eV

      28.0       1.4
      43.0       2.2
      63.0       1.1
      76.0       2.0
      77.0       1.0
      82.0       1.1
      88.0       1.4
      89.0       2.4
      94.5       1.2
     109.0       2.4
     115.0       3.9
     125.5       1.4
     126.0       1.7
     127.0       3.2
     128.0       4.1
     129.0       1.6
     132.0      14.2
     132.5       2.6
     137.0       2.6
     139.0       2.2
     139.5       3.5
     140.0       1.1
     141.0       3.3
     142.0       1.4
     143.0       3.0
     151.0       1.2
     152.0       3.0
     153.0       1.3
     155.0       2.5
     165.0       4.9
     166.0       1.3
     167.0       1.0
     169.0       1.8
     171.0       1.6
     176.0       1.4
     177.0       1.1
     178.0       3.1
     179.0       2.7
     180.0       1.0
     181.0       1.2
     189.0       2.3
     190.0       1.4
     191.0       1.3
     193.0       1.1
     195.0       1.4
     205.0       1.6
     207.0       1.6
     208.0       1.1
     209.0       1.2
     219.0       1.5
     221.0       1.9
     222.0       1.4
     223.0       2.0
     225.0       1.3
     233.0       1.8
     234.0       1.0
     235.0       5.0
     236.0       2.4
     237.0       3.5
     238.0       1.5
     239.0       1.1
     249.0       1.4
     250.0       3.0
     251.0      44.0
     252.0      10.9
     253.0       2.5
     261.0       2.9
     262.0       2.1
     263.0       3.6
     264.0       8.5
     265.0      33.6
     266.0       7.0
     267.0       1.6
     277.0       4.2
     278.0       2.0
     279.0      94.5
     280.0      18.7
     281.0       3.2
     292.0       1.7
     293.0       2.4
     294.0     100.0
     295.0      21.1
     296.0       4.6