3β-DOXYL-5α-胆甾烷，自由基是水分散体中EPR研究和电子自旋晶格弛豫时间的自旋标记。 3β-DOXYL-5α-cholestane, free radical is a spin label for EPR studies and electron spin-lattice relaxation times in aqueous dispersions. Application： Free radical spin label used for EPR studies. Studying transversal relaxation of nitroxides for PELDOR in phospholipid membranes Comparative studies of effect of cholesterol on bicelle model membranes Spin probe for studying electron spin-lattice relaxation times in aqueous dispersions via saturation recovery Probing cooperative and local modes of poly(Me acrylate) sample using ESR Studying random disorder effects of hydrophyobic aerosil on order and dynamics of the probe in 5CB nematic liquid crystals