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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Nucl Med Biol. 2016 Sep 3;44:4–30. doi: 10.1016/j.nucmedbio.2016.08.015

Fig. 2.

Fig. 2

Structures and σ1 receptor binding affinities of SA4503 and analogs, that provides a rationale for modification of E-IA-DM-PE-PIPZE to E-IA-BF-PE-PIPZE. aData taken from [46]; bData taken from [64]; cData taken from [63].