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. Author manuscript; available in PMC: 2012 Mar 23.
Published in final edited form as: Bioorg Med Chem. 2008 Apr 16;16(11):6261–6268. doi: 10.1016/j.bmc.2008.04.029

Figure 1.

Figure 1

General structures of series 1–4. The R2, R3, and R4 substituents in series 1–3 are as follows, namely a: R2 = R4 =H, R3 = N(CH3)2; b: R2 = R4 =H, R3 = OCH3; c: R2 = R4 =H, R3 = CH3; d: R2 = R3 = R4 = OCH3; e: R2 = R3 = R4 = H; f: R2 = R4= H, R3 = F; g: R2 = R4 = H, R3 = Cl.