title: Osteosaponins 1 and 2: two new saponin glycosides from Osteospermum vaillantii.
abstract: Osteospermum vaillantii (Decne) T. Norl., collected from southern Saudi Arabia, yielded two new saponins characterised as 3-O-beta-D-glucopyranosyl-(2' --> 1'')-beta-D-glucopyranosyl-(3' --> 1''')-O-beta-D-galactopyranosyl-oleanolic acid, designated as osteosaponin, and 3-O-beta-D-glucopyranosyl-(2' --> 1'')-beta-D-glucopyranosyl-(2''-1''''')-beta-D-glucopyranosyl-(3' --> 1''')-O-beta-(-D-galactopyranosyl-oleanolic-acid-28-C(O)-O-beta-D-(1'''')-glucopyranosyl ester, designated as osteosaponin. The sugar attachments and configurations were confirmed by spectroscopic methods, that is, 1H, 13C-NMR, COSY, HSQC and HMBC-NMR experiments.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hamdard University, New Delhi 110062, India. baharchem@yahoo.com
authors.forename: Bahar
authors.initials: B
authors.lastname: Ahmed
authors.forename: Riaz A
authors.initials: RA
authors.lastname: Khan
authors.forename: Tawfeq A
authors.initials: TA
authors.lastname: Al-Howiriny
authors.forename: Adnan J
authors.initials: AJ
authors.lastname: Al-Rehaily
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification*; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D012529:Saudi Arabia
chemical_list: D006027:Glycosides; D010936:Plant Extracts; D012503:Saponins