Gallocatechol or Gallocatechin (EGC) is a flavan-3-ol, a type of chemical compound including catechin, with the gallate residue being in an isomeric trans position. It is one of the antioxidant chemicals found in food.

This compound possesses two epimers. The most common, (+)-Gallocatechin (GC), is found notably in green tea. Other sources of (+)-Gallocatechin are bananas, Persimmon and Pomegranate. The other enantiomer is called (-)-Gallocatechin or ent-Gallocatechin.

This compound had been shown to have moderate affinity to the human cannabinoid receptor, which may contribute to the health benefits found by consuming green tea.

Epigallocatechin is an other type of catechin, with the gallate residue being in an isomeric cis position. It can be found in St John's wort.

Leucocyanidin (Leucocianidol) is a colorless chemical compound related to leucoanthocyanidins. Leucocyanidin oxygenase uses leucocyanidin, 2-oxoglutarate, and O₂ to produce cis-dihydroquercetin, trans-dihydroquercetin (taxifolin), succinate, CO₂, and H₂O. Leucoyanidin can be found in Horse Chestnut, Cashew, Acajou, Earth Nut, Areca Nut, American Custard Apple, Cherry, Camphor, Coca, Honey locust, American Witch Hazel, Hippophae Berry Sanddorn, Barley, Bine, Perikon Amber, Hsin-I Yulan-Magnolie, Blue Mallow, Banana, Baladi Bean, Eastern White Pine, Black Cherry, Common Guava, White Oak, Common Oak, Arizona Dock, Brazilian Pepper Tree, Arjun, Indian Almond, Cacao, Sea Squill, Bell-Bean, Common Grape Vine, Corn, Mais, Jujube, Chinese date.