<unk> s are a group of chemical substances found in plants, characterized by the presence of more than one phenol group per molecule.<unk> s are generally further subdivided into hydrolyzable tannins, which are gallic acid esters of glucose and other sugars; and phenylpropanoids, such as lignins,  flavonoids, and condensed tannins.
Polyphenol
Hydrocarbon
Diol
Haloalkane
Glycolipid
Terpene
Phospholipid
Polycyclic aromatic hydrocarbon