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Structural formula of eight catechins. Catechins have many chemical structural features, such as hydroxyl groups (–OH), that combine easily with other materials. There are eight catechins: C ((-)-catechin), EC ((-)-epicatechin), ECG ((-)-epicatechingallate), EGC ((-)-epigallocatechin), EGCG ((-)-epigallocatechin gallate), GC ((-)-gallocatechin), CG ((-)-catechingallate), and GCG ((-)-gallocatechingallate). The principle types are C, EC, ECG, EGC, and EGCG
