title: Alkaloids from the twigs of Daphniphyllum calycinum.
abstract: Twelve new alkaloids, caldaphnidines G-R (1-12), along with 24 known ones, were isolated from the twigs of Daphniphyllum calycinum. Their structures were elucidated by spectroscopic methods, especially two-dimensional NMR techniques.
authors.affiliation: State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai, 201203, People's Republic of China.
authors.forename: Chuan-Rui
authors.initials: CR
authors.lastname: Zhang
authors.forename: Sheng-Ping
authors.initials: SP
authors.lastname: Yang
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Yue
mesh_terms: D000470:Alkaloids / Q000737:chemistry; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D006576:Heterocyclic Compounds, 4 or More Rings / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D031995:Saxifragaceae / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D004365:Drugs, Chinese Herbal; D006576:Heterocyclic Compounds, 4 or More Rings