Cooh

c/s-2-Coumarlc acid Coumarln

Medlcarpln (pterocarpan)

Chalcone

Isoflavone (Isoflavonol)

Flavone

Glyceollln (pterocarpan)

OH O Flavanone

-On Anthocyanldln

kaempherol-3-glucoslde

Flavonol

| Fig. 2. Biosynthetic pathways of flavanes (flavonoids) and coumarins. Coumarins, isoflavones and pterocarpans are important phytoaiexins. Not all the reactions which can be catalysed by an enzyme are shown by the arrows. Chalcone synthase (1) is induced by UV and blue light. (2): chalcone flavanone isomerase, (3): 3'-hydroxylase, (4): flavanone dehydrogenase, (5): flavonol synthase, (6): dihydrofiavanol-4-reductase, (7): methyltransferase. (After Richter 1996)

Flavanonol/ dlhydroflavonol

OH OH Flavan-3, 4-dlol

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