title: Two pyranocoumarins from the seeds of Calophyllum polyanthum.
abstract: Two new pyranocoumarin diastereoisomers, calopolyanolides C (1) and D (2), were isolated from the ethanolic extract of the seeds of Calophyllum polyanthum, along with calopolyanolide A (3), calopolyanolide B (4), calanolide E2 (5), 5,7,3',4'-tetrahydroxyisoflavone (6), 3,4-dihydroxybenzoic acid (7), 3,4,5-trihydroxybenzoic acid (8), 2-hydroxy-4-methoxybenzoic acid (9), beta-sitosterol (10), beta-daucosterol (11), 3,5-dihydroxy-4-methoxybenzoic acid (12), 3,5-dimethoxybenzoic acid (13), and ursolic acid (14). Their structures were determined by MS, UV, and IR data and HMQC, HMBC, and NOESY experiments or by comparing them with authentic samples. X-ray crystallographic analysis confirmed the structure and relative configuration of 1.
authors.affiliation: Chengdu Institute of Biology, the Chinese Academy of Sciences, Chengdu 610041, People's Republic of China.
authors.forename: Chun-Hui
authors.initials: CH
authors.lastname: Ma
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
authors.forename: Hua-Yi
authors.initials: HY
authors.lastname: Qi
authors.forename: Bo-Gang
authors.initials: BG
authors.lastname: Li
authors.forename: Guo-Lin
authors.initials: GL
authors.lastname: Zhang
mesh_terms: D029759:Calophyllum / Q000737:chemistry*; D002681:China; D003374:Coumarins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D018360:Crystallography, X-Ray; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D039681:Pyranocoumarins / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D003374:Coumarins; D039681:Pyranocoumarins; C493139:calopolyanolide C