title: Eremostachiin: a new furanolabdane diterpene glycoside from Eremostachys glabra.
abstract: The reversed-phase preparative HPLC analysis of the methanol extract of the rhizomes of Eremostachys glabra (Lamiaceae) led to the isolation of two furanolabdane diterpene glycosides, phlomisoside II, and beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosyl ester of phlomisoic acid (named eremostachiin), the latter being a novel natural product. The structure of the new compound has been elucidated unambiguously by HRMS and a series of 1D- and 2D-NMR spectroscopic techniques. The free radical scavenging activity of these compounds was assessed using the DPPH assay.
authors.affiliation: School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Delazar
authors.forename: Masoud
authors.initials: M
authors.lastname: Modarresi
authors.forename: Mohammad
authors.initials: M
authors.lastname: Shoeb
authors.forename: Lutfun
authors.initials: L
authors.lastname: Nahar
authors.forename: Raymond G
authors.initials: RG
authors.lastname: Reid
authors.forename: Yashodharan
authors.initials: Y
authors.lastname: Kumarasamy
authors.forename: Runner R T
authors.initials: RR
authors.lastname: Majinda
authors.forename: Satyajit D
authors.initials: SD
authors.lastname: Sarker
mesh_terms: D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification*; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D027343:Rhizome / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D005960:Glucosides; C509360:eremostachiin