title: Two new quinochalcones from the florets of Carthamus tinctorius.
abstract: Two new quinochalcone compounds, named saffloquinoside A (1) and saffloquinoside B (2), were isolated from the florets of Carthamus tinctorius. Their unusual structures including their absolute stereochemistry were elucidated based on UV, IR, HRESIMS, 1D and 2D NMR data, and CD spectrum. Saffloquinoside A has an uncommon six-five member dioxaspirocycle and saffloquinoside B has a cyclohexatrione skeleton with a benzyl group and two C-glycosyl units. Saffloquinoside A exhibited middling anti-inflammatory activity.
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: Jian-Shuang
authors.initials: JS
authors.lastname: Jiang
authors.forename: Jun
authors.initials: J
authors.lastname: He
authors.forename: Zi-Ming
authors.initials: ZM
authors.lastname: Feng
authors.forename: Pei-Cheng
authors.initials: PC
authors.lastname: Zhang
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D031187:Carthamus tinctorius / Q000737:chemistry*; D002599:Chalcone / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D035264:Flowers / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005966:Glucuronidase / Q000037:antagonists & inhibitors* / Q000378:metabolism; D007249:Inflammation / Q000188:drug therapy*; D008968:Molecular Conformation; D009504:Neutrophils / Q000201:enzymology; D051381:Rats; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D004791:Enzyme Inhibitors; D005960:Glucosides; C549986:saffloquinoside A; C549987:saffloquinoside B; D002599:Chalcone; D005966:Glucuronidase