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Table 2 Structure of phenolic compounds in plants

From: Phenolic compounds as natural feed additives in poultry and swine diets: a review

Class Structure
Simple phenolics, benzoquinones C6
Hydroxybenzoic acids C6-C1
Acetophenones, phenylacetic acids C6-C2
Hydroxycinnamic acids, phenylpropanoids C6-C3
Xanthones C6-C1-C6
Stilbenes, anthraquinones C6-C2-C6
Flavonoids, isoflavonoids C6-C3-C6
Lignans, neolignans (C6-C3)2
Lignins (C6-C3)n
Condensed tannins (proanthocyanidins or flavolans) (C6-C3-C6)n
  1. Source: Ref. [12]