The shielding of the steroidal C-19 methyl carbon directly signals the stereochemistry of the A/B ring junction; its absorption position differs by 11–12 p.p.m. between 5α- and 5β-steroids.
J. L. Gough, J. P. Guthrie and J. B. Stothers, J. Chem. Soc., Chem. Commun., 1972, 979 DOI: 10.1039/C39720000979
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