title: Novel polyesterified 3,4-seco-grayanane diterpenoids as antifeedants from Pieris formosa.
abstract: Pieris formosa is a poisonous plant to livestock and is used as an insecticide in rural areas of China. Two novel polyesterified 3,4-seco-grayanane diterpenoids, pierisoids A and B (1 and 2), were isolated from its flowers and were identified by spectroscopic analysis and X-ray diffraction. Both compounds showed obvious antifeedant activity against cotton bollworm, indicating their toxic properties, suggesting a defensive role of polyesterified 3,4-seco-grayanane diterpenoids for P. formosa against herbivores.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, PR China.
authors.forename: Chun-Huan
authors.initials: CH
authors.lastname: Li
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Niu
authors.forename: Qian
authors.initials: Q
authors.lastname: Luo
authors.forename: Ming-Jin
authors.initials: MJ
authors.lastname: Xie
authors.forename: Shi-Hong
authors.initials: SH
authors.lastname: Luo
authors.forename: Yan-Ying
authors.initials: YY
authors.lastname: Zhou
authors.forename: Sheng-Hong
authors.initials: SH
authors.lastname: Li
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity*; D029791:Ericaceae / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry; D007306:Insecticides / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity*; D008958:Models, Molecular; D008968:Molecular Conformation; D009036:Moths / Q000187:drug effects*; D013237:Stereoisomerism
chemical_list: D004224:Diterpenes; D007306:Insecticides; C551382:pierisoid A; C551383:pierisoid B