substitutions. The oxo groups located at the longitudinal (3‐oxo) vs. transversal (7‐ and 12‐oxo) axes of the steroid framework show very different quadrupolar relaxation properties and 17O NMR linewidths owing to the strong anisotropy of overall molecular motion. In contrast, the 17O NMR linewidths of all 3α‐, 7α‐ and 12α‐hydroxyls are very similar and clearly smaller than those of the corresponding oxo groups