5NX0:
reference: Combining EPR spectroscopy and X-ray crystallography to elucidate the structure and dynamics of conformationally constrained spin labels in T4 lysozyme single crystals., Consentius P, Gohlke U, Loll B, Alings C, Heinemann U, Wahl MC, Risse T, Phys Chem Chem Phys. 2017 Aug 9;19(31):20723-20734. doi: 10.1039/c7cp03144k. PMID: 28740983

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