Fig.8. High-resolution HR-G-SERF experiments on the complex sample of estradiol under different magnetic field conditions. (a) Molecular conformation and observed coupling networks; (b~d) 1D NMR and HR-G-SERF spectra acquired in a well-shimmed field with selected protons 9 and 15α, respectively; (e~g) 1D NMR and HR-G-SERF spectra acquired in a inhomogeneous with selected protons 9 and 15α, respectively (Reproduced from Ref. [53])