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. Author manuscript; available in PMC: 2013 Apr 12.
Published in final edited form as: J Med Chem. 2012 Mar 30;55(7):3076–3087. doi: 10.1021/jm201504s

Figure 2.

Figure 2

Putative mechanism describing reaction products observed using UV absorbance chromatogram at 250 nm for 9a (75 μM) in the presence of excess cysteine (2.5 mM) in PBS (50 mM, pH 7.4) at 37 °C for 2 h. Approximate % of products determined by integration of UV absorbance peaks. Structures assigned based on LC-MS/MS analysis of parent and daughter ions.