title: Four new alkaloids from Polyalthia nemoralis (Annonaceae).
abstract: Four new alkaloids, polynemoralines A (1), B (2), C (3), and D (4), were isolated from the branches and leaves of Polyalthia nemoralis A DC. The structures of 1-4 were elucidated mainly on the basis of spectroscopic methods. The structure of 4 was confirmed by X-ray diffraction analysis.
authors.affiliation: The Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
authors.forename: Zi-Ming
authors.initials: ZM
authors.lastname: Lu
authors.forename: Qing-Jian
authors.initials: QJ
authors.lastname: Zhang
authors.forename: Ruo-Yun
authors.initials: RY
authors.lastname: Chen
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Yu
mesh_terms: D000470:Alkaloids / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D031044:Polyalthia / Q000737:chemistry*
chemical_list: D000470:Alkaloids