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free radical

3-(2-Iodoacetamido)-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, free radical
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:


162-164 °C (lit.)

storage temp.


SMILES string




InChI key


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General description

3-(2-Iodoacetamido)-PROXYL is a free radical used as a spin probe in spin labeling techniques. This technique is helpful in investigating the dynamic aspects of molecular interactions of substances, proteins, lipids, and cell membranes.


25 mg in glass bottle


Sulfhydryl group specific spin label. Applications include study of ozone-treated human and bovine erythrocyte membrane proteins and the orientation of myosin subfragment on muscle fibers. DNA fragments containing phosphorothioate diesters can be labeled by spin labels.

Storage Class Code

13 - Non Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Claire Bagnéris et al.
Nature communications, 4, 2465-2465 (2013-09-21)
Voltage-gated sodium channels have essential roles in electrical signalling. Prokaryotic sodium channels are tetramers consisting of transmembrane (TM) voltage-sensing and pore domains, and a cytoplasmic carboxy-terminal domain. Previous crystal structures of bacterial sodium channels revealed the nature of their TM...
Christoph Gmeiner et al.
Physical chemistry chemical physics : PCCP, 19(41), 28360-28380 (2017-10-17)
A combined method, employing NMR and EPR spectroscopies, has demonstrated its strength in solving structures of protein/RNA and other types of biomolecular complexes. This method works particularly well when the large biomolecular complex consists of a limited number of rigid...
Site directed nitroxide spin labeling of oligonucleotides for NMR and EPR studies
Shepherd NE, et al.
Tetrahedron, 71(5), 813-819 (2015)
Na Li et al.
Scientific reports, 10(1), 393-393 (2020-01-17)
Fowlpox virus resolvase (Fpr) is an endonuclease that cleaves a broad range of branched DNA structures, including the Holliday junction (HJ), with little sequence-specificity. To better understand the mechanisms underlying its relaxed substrate specificity, we determined the crystal structures of...
Isabelle Lebars et al.
Nucleic acids research, 42(15), e117-e117 (2014-07-02)
Site-directed spin labeling is emerging as an essential tool to investigate the structural and dynamical features of RNA. We propose here an enzymatic method, which allows the insertion of a paramagnetic center at a specific position in an RNA molecule....

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