title: Reinvestigation of structures of robustasides B and C, and isolation of (E)-2,5-dihydroxycinnamic acid esters of arbutin and glucose from the leaves of Grevillea robusta.
abstract: From the leaves of Grevillea robusta, compounds whose NMR data were superimposable on those of robustasides B and C were isolated along with two new compounds, (E)-2,5-dihydroxycinnamic acid esters of arbutin and D-glucose, and two known compounds, robustaside A and (E)-2,5-dihydroxycinnamic acid. The structures of robustasides B and C were not arbutin caffeates, being revised to arbutin (E)-2,5-dihydroxycinnamic acid esters.
authors.affiliation: Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Hiroshima 734-8553, Japan.
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Yamashita-Higuchi
authors.forename: Sachiko
authors.initials: S
authors.lastname: Sugimoto
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Matsunami
authors.forename: Hideaki
authors.initials: H
authors.lastname: Otsuka
mesh_terms: D001104:Arbutin / Q000737:chemistry* / Q000302:isolation & purification; D003373:Coumaric Acids / Q000737:chemistry* / Q000302:isolation & purification; D005947:Glucose / Q000737:chemistry* / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D039105:Proteaceae / Q000737:chemistry*
chemical_list: D003373:Coumaric Acids; D006027:Glycosides; D010636:Phenols; C578580:robustaside B; C578581:robustaside C; D001104:Arbutin; D005947:Glucose