Figure 5.
LC–MS/MS analysis of the putative sunitinib quinoneimine dansyl–GSH conjugate. Sunitinib (25 μM) was incubated with recombinant P450 1A2 Supersomes (20 nM) in the presence of an NADPH-regenerating system and supplemented with dansyl–GSH (1 mM) for 30 min. Shown is a representative product ion spectrum from LC–MS/MS analysis of the precursor ion m/z 935, corresponding to the quinoneimine dansyl–GSH conjugate. The predicted structure of the sunitinib quinoneimine dansyl–GSH conjugate is shown above.