122 – 123. 301 – 309. This is produced in exactly the same way

FURTHER READING 287 Ginkgo Braquet P, Esanu A, Buisine E, Hosford D, Broquet C and Koltai M 1991 Recent progress in ginkgolide research. Med Res Rev 11, 295 – 355. Braquet P and Hosford D 1991 Ethnopharmacology and the development of natural PAF antagonists as therapeutic agents. J Ethnopharmacol 32, 135 – 139. Houghton P 1994 Herbal products: Ginkgo. Pharm J

253, 122 – 123.

Sticher O 1993 Quality of Ginkgo preparations. Planta Med 59 , 2 – 11. Forskolin Bhat SV 1993 Forskolin and congeners. Prog Chem Org Nat Prod 62 , 1 – 74. Hurley JH 1999 Structure, mechanism, and regulation of mammalian adenylyl cyclase. J Biol Chem 274, 7599 – 7602. Laurenza A, Sutkowski EM and Seamon KB 1989 Forskolin: a specific stimulator of adenylyl cyclase or a diterpene with multiple sites of action? Trends Pharmacol Sci 10 , 442 – 447. Stevioside Hanson JR and de Oliveira BH 1993 Stevioside and related sweet diterpenoid glycosides. Nat Prod Rep

10, 301 – 309.

Triterpenoids Abe I and Prestwich GD 1999 Squalene epoxidase and oxidosqualene:lanosterol cyclase – key enzymes in cholesterol biosynthesis. Comprehensive Natural Products Chemistry , Vol 2. Elsevier, Amsterdam, pp 267 – 298. Abe I, Rohmer M and Prestwich GD 1993 Enzymatic cyclization of squalene and oxidosqualene to sterols and triterpenes. Chem Rev 93, 2189 – 2206. Abe I, Tomesch JC, Wattanasin S and Prestwich GD 1994 Inhibitors of squalene biosynthesis and metabolism. Nat Prod Rep 11, 279 – 302. Brown GD 1998 Biosynthesis of steroids and triter- penoids. Nat Prod Rep 15, 653 – 696. Connolly JD and Hill RA 2000 Triterpenoids. Nat Prod Rep 17 , 463 – 482. Earlier reviews: 1999, 16, 221 – 240; 1997, 14, 661 – 679. Poralla K 1999 Cycloartenol and other triterpene cyclases. Comprehensive Natural Products Chem- istry , Vol 2. Elsevier, Amsterdam, pp 299– 319. Shechter I, Guan G and Boettcher BR 1999 Squalene synthase. Comprehensive Natural Products Chem- istry , Vol 2. Elsevier, Amsterdam, pp 245– 266. Wendt KU, Schultz GE, Corey EJ and Liu DR 2000 Enzyme mechanisms for polycyclic triterpene forma- tion. Angew Chem Int Edn 39, 2812 – 2833. Triterpenoid Saponins Mahato SB and Garai S 1998 Triterpenoid saponins. Prog Chem Org Nat Prod 74 , 1 – 196. Yoshiki Y, Kodon S and Okubo K 1998 Relationship between chemical structures and biological activi- ties of triterpenoid saponins from soybean. Biosci Biotechnol Biochem 62 , 2291 – 2199. Liquorice Lewis DA 1992 Antiulcer drugs from plants. Chem Brit 141 – 144. Lewis DA and Hanson PJ 1991 Antiulcer drugs of plant origin. Prog Med Chem 28, 201 – 231. Nomura T and Fukai T 1998 Phenolic constituents of licorice Glycyrrhiza species. Prog Chem Org Nat Prod 73 , 1 – 140 note: includes triterpenoid saponins. Ginseng Chuang W-C, Wu H-K, Sheu S-J, Chiou S-H, Chang H-C and Chen Y-P 1995 A comparative study on commercial samples of Ginseng Radix. Planta Med 61, 459 – 465. Raman A and Houghton P 1995 Herbal products: ginseng. Pharm J 254, 150 – 152. Limonoids Champagne DE, Koul O, Isman MB, Scudder GGE and Towers GHN 1992 Biological activity of limonoids from the Rutales. Phytochemistry 31, 377 – 394 Ley SV, Denholm AA and Wood A 1993 The chem- istry of azadirachtin. Nat Prod Rep 10, 109 – 157. Sesterterpenoids Hanson JR 1996 The sesterterpenoids. Nat Prod Rep

13, 529 – 535. Earlier review : 1992, 9, 481 – 489.