title: Structure elucidation and complete NMR spectral assignments of two new dammarane-type tetraglycosides from Panax quinquefolium.
abstract: Two new saponins were isolated from leaves of Panax quinquefolium and their structures were elucidated as 3beta, 12beta, 20S-trihydroxy-25-methoxydammar-23-ene 3-O-{[beta-D-glucopyranosyl(1-->2)-beta-D-glucopyranosyl]-20-O-[alpha-L-arabinopyranosyl(1-->6)]-beta-D-glucopyranoside (1) and 3beta, 20S-dihydroxy-12beta, 23R-epoxydammar-24-ene 3-O-{[beta-D-glucopyranosyl(1-->2)-beta-D-glucopyranosyl]-20-O-[beta-D-xylopyanosyl(1-->6)]-beta-D-glucopyranoside (2) on the basis of (1)D and (2)D NMR (including (1)H, (13)C-NMR, (1)H-(1)H COSY, HSQC, TOCSY, HMBC, and NOESY), ESI-MS spectrometry and chemical methods.
authors.affiliation: College of Pharmacy, Liaoning University of Traditional Chinese Medicine, 77 Life one Road, DD Port, Dalian 116600, China.
authors.forename: Hai-Ping
authors.initials: HP
authors.lastname: Jiang
authors.forename: Ying-Kun
authors.initials: YK
authors.lastname: Qiu
authors.forename: Da-Ren
authors.initials: DR
authors.lastname: Cheng
authors.forename: Ting-Guo
authors.initials: TG
authors.lastname: Kang
authors.forename: De-Qiang
authors.initials: DQ
authors.lastname: Dou
mesh_terms: D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D005894:Panax / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*; D000097669:Dammaranes
chemical_list: D006027:Glycosides; D014315:Triterpenes; D000097669:Dammaranes