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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Bioorg Med Chem. 2013 Jun 26;21(17):10.1016/j.bmc.2013.06.046. doi: 10.1016/j.bmc.2013.06.046

Figure 2.

Figure 2

Stuctures of 4-aza-PPT analogues (5), podophyllic aldehyde (6), combretastatin A-4 (7), 2-PQ derivatives and the target compounds (12a–n).