title: E- and Z-isomers of new phytoecdysteroid conjugates from French Polynesian Microsorum membranifolium (Polypodiaceae) fronds.
abstract: Phytochemical investigation of the fronds of Microsorum membranifolium resulted in the isolation of a new phytoecdysteroid, E-2-deoxy-20-hydroxyecdysone 3-[4-(1-β-D-glucopyranosyl)]-caffeate (1), together with two known phytoecdysteroids, E-2-deoxy-20-hydroxyecdysone 3-[4-(1-β-D-glucopyranosyl)]-ferulate (2), E-2-deoxyecdysone 3-[4-(1-β-D-glucopyranosyl)]-ferulate (3). Their respective Z-isomers 4-6 were also observed and identified for the first time. The new structures were elucidated on the basis of extensive spectroscopic data analysis (1D, 2D-NMR and HR-MS techniques).
authors.affiliation: Laboratoire Biodiversité Terrestre et Marine, Université de la Polynésie Française, B.P. 6570 Faa'a, 98702 FAA'A, Tahiti, French Polynesia.
authors.forename: Raimana
authors.initials: R
authors.lastname: Ho
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Girault
authors.forename: Phila
authors.initials: P
authors.lastname: Raharivelomanana
authors.forename: René
authors.initials: R
authors.lastname: Lafont
mesh_terms: D026461:Ecdysteroids / Q000737:chemistry*; D007536:Isomerism; D010936:Plant Extracts / Q000737:chemistry; D011114:Polynesia; D029621:Polypodiaceae / Q000737:chemistry*
chemical_list: D026461:Ecdysteroids; D010936:Plant Extracts