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. Author manuscript; available in PMC: 2020 Jun 1.
Published in final edited form as: J Magn Reson. 2019 Apr 22;303:115–120. doi: 10.1016/j.jmr.2019.04.013

Figure 1:

Figure 1:

Chemical structure of paramagnetic TOTAPOL3 (left) and illustration of its reduction to the DNP inactive (providing DNP enhancement only if in close proximity to another radical) monoradical and DNP silent (incapable of providing DNP enhancement) hydroxylamine forms.