广藿香Pogostemon cablin(Blanco) Benth(唇形科)为中医常用的芳香化湿药,也是著名的香料作物。我国主产广东,因产区不同而分为石牌藿香(广州郊区产)、海南藿香(海南、湛江产)等商品规格。药工经验认为,石牌藿香气香质优。1973年我们从石牌藿香挥发油中获得一结晶成分,熔点32.5—33℃,易溶于碱性水溶液及一般有机溶剂。经测定其化学结构为3-(4′-甲基戊酰基)—6-甲基-3,4-二氢-1,2-吡喃-2,4-二酮(Ⅱ),定 Pogostemon cablin (Blanco) Benth (Labiatae) is a commonly used aromatherapy wet medicine, is also a well-known spice crops. Our country’s main production in Guangdong, due to the different producing areas is divided into Patchouli (Guangzhou suburbs production), Hainan Agastache (Hainan, Zhanjiang production) and other commodity specifications. Medicinal experience that the poker patchy aroma excellent. In 1973, we obtained a crystalline component from Pistacia chinensis Essential Oil, melting point 32.5-33 ℃, soluble in alkaline aqueous solution and general organic solvents. Its chemical structure was determined to be 3- (4’-methylvaleryl) -6-methyl-3,4-dihydro-1,2-pyran-2,4-dione (II)