title: Dependence of the 1H NMR chemical shifts of ring F resonances on the orientation of the 27-methyl group of spirostane-type steroidal sapogenins.
abstract: A relationship between the 1H NMR chemical shifts of the ring F resonances and orientation of the H3-27 group has been derived for the establishment of 25R- and 25S-stereochemistry in spirostane type of steroidal sapogenins.
authors.affiliation: Central Institute of Medicinal and Aromatic Plants, Lucknow, India.
authors.forename: P K
authors.initials: PK
authors.lastname: Agrawal
authors.forename: P
authors.initials: P
authors.lastname: Bunsawansong
authors.forename: G A
authors.initials: GA
authors.lastname: Morris
mesh_terms: D004365:Drugs, Chinese Herbal; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010840:Phytosterols / Q000737:chemistry; D012502:Sapogenins / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry*; D013150:Spirostans / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D004365:Drugs, Chinese Herbal; D010840:Phytosterols; D012502:Sapogenins; D012503:Saponins; D013150:Spirostans; C046297:sarsasapogenin