title: Siamenols A-D, four new coumarins from Mammea siamensis.
abstract: Further investigation of the dichloromethane extract of the twigs of Mammea siamensis led to the isolation of four novel coumarins, named siamenols A-D (1-4) together with three known xanthones. The structures of the new coumarins were elucidated by spectroscopic analysis, including 2D NMR spectroscopic data. In addition, the absolute stereochemistry of hydroxyl group of siamenol C (3) was determined to be S configuration by using modified Mosher's method.
authors.affiliation: Chulabhorn Research Institute, Vipavadee Rangsit Highway, Bangkok 10210, Thailand.
authors.forename: Vilailak
authors.initials: V
authors.lastname: Prachyawarakorn
authors.forename: Chulabhorn
authors.initials: C
authors.lastname: Mahidol
authors.forename: Somsak
authors.initials: S
authors.lastname: Ruchirawat
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification; D000972:Antineoplastic Agents, Phytogenic / Q000302:isolation & purification / Q000494:pharmacology; D001685:Biological Factors / Q000737:chemistry / Q000302:isolation & purification; D002227:Carbazoles / Q000737:chemistry* / Q000302:isolation & purification; D003374:Coumarins / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D031252:Mammea / Q000737:chemistry*; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry; D013237:Stereoisomerism; D044004:Xanthones / Q000302:isolation & purification
chemical_list: D000470:Alkaloids; D000972:Antineoplastic Agents, Phytogenic; D001685:Biological Factors; D002227:Carbazoles; D003374:Coumarins; D044004:Xanthones; C408013:siamenol