Arsenical probes {enable|allow} structural {studies|research} of proteins. We report {the first|the very first|the initial} organoarsenic probes for nuclear magnetic resonance (NMR) spectroscopy to study proteins in {solutions|options}. These probes {can be|may be|could be|might be|is often|is usually} attached to irregular loop regions. A lanthanide-binding tag induces sizable pseudocontact shifts in protein NMR spectra of a magnitude {never|by no means|in no way|never ever|under no circumstances} observed for {small|little|tiny|modest|smaller|compact} paramagnetic probes {before|prior to|just before|ahead of}. 4-Bromobutoxy-tert-butyl-dimethylsilane Formula Fmoc-B-HoPhe-OH Chemical name PMID:23746961
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