title: Psidials A-C, three unusual meroterpenoids from the leaves of Psidium guajava L.
abstract: Three novel sesquiterpenoid-based meroterpenoids of psidials A-C (1-3) have been isolated from the leaves of Psidium guajava L. Their complete structures were elucidated by spectral and chemical methods, and that of 1 was confirmed by single-crystal X-ray diffraction analysis. Psidial B (2) and C (3) represented the new skeleton of the 3,5-diformylbenzyl phloroglucinol-coupled sesquiterpenoid. A possible biosynthetic pathway for 2-3 was postulated. 2-3 showed activity to enzyme PTP1B in 10 microM.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College (Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education), Beijing 100050, People's Republic of China.
authors.forename: Hui-Zheng
authors.initials: HZ
authors.lastname: Fu
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Luo
authors.forename: Chuang-Jun
authors.initials: CJ
authors.lastname: Li
authors.forename: Jing-Zhi
authors.initials: JZ
authors.lastname: Yang
authors.forename: Dong-Ming
authors.initials: DM
authors.lastname: Zhang
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006801:Humans; D051379:Mice; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1 / Q000037:antagonists & inhibitors*; D031647:Psidium / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D004365:Drugs, Chinese Herbal; D012717:Sesquiterpenes; C547338:psidial A; C547339:psidial B; C547340:psidial C; D054562:Protein Tyrosine Phosphatase, Non-Receptor Type 1