Flavonoid Drugs Including Ginkgo Biloba and Echinaceae Species

The main constituents of flavonoid drugs are 2-phenyl-y-benzopyrones (2-phenyl chromones) or structurally related, mostly phenolic, compounds. 

The various structure types of flavonoids differ in the degree of oxidation of the C ring and in the substitution pattern in the A and/or B rings (see 7.1.5 Formulae). Most of these compound.s are present in the drugs as mono- or diglycosides. 

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Flavonoid Drugs Including Ginkgo Biloba and Echinaceae Species... 

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