title: Polystanins A-D, four new protolimonoids from the fruits of Aphanamixis polystachya.
abstract: Two new apo-tirucallane triterpenoids with six-membered hemiketal, polystanins A (1) and B (2), and two new tirucallane triterpenoids, polystanins C (3) and D (4) were isolated from the fruits of Aphanamixis polystachya. They were elucidated on the basis of detailed spectroscopic analysis including IR, high resolution-electrospray ionization (HR-ESI)-MS, 1 dimensional (1D)- and 2D-NMR. Their absolute configurations were determined by a combination of modified Mosher's method, and electronic circular dichroism (ECD) calculation.
authors.affiliation: State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, PR China
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jun-Song
authors.initials: JS
authors.lastname: Wang
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Wang
authors.forename: Yu-Cheng
authors.initials: YC
authors.lastname: Gu
authors.forename: Ling-Yi
authors.initials: LY
authors.lastname: Kong
mesh_terms: D002942:Circular Dichroism; D005638:Fruit / Q000737:chemistry*; D036701:Limonins / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D029582:Meliaceae / Q000737:chemistry*; D008958:Models, Molecular
chemical_list: D036701:Limonins