TOAC, a nitroxide spin-labeled, achiral Cα-tetrasubstituted α-amino acid, is an excellent tool in material science and biochemistry

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The 2,2,6,6-tetramethylpiperidine-1-oxyl-4-amino-4-carboxylic acid is a nitroxide spin-labeled, achiral Cα-tetrasubstituted α-amino acid that has recently been shown to be an effective β-turn and 310/α-helix inducer in peptides and an excellent and relatively rigid electron spin resonance probe and fluorescence quencher.