A negative ion electrospray ionization (ESI) spectrum ofketoprofen is given in Figure 9.3.
100 M+HCOO- 299.1 Fig. 9.3 A negative ion electrospray ionisation (ESI) spectrum of ketoprofen. 80 ola COO 60 Relative abundance 40 M.CH 289.1 91.0 20 137.0 MH 253.1 0 50 150 350 450 250 miz
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