Doc:FL63AG

Gallocatechins refer to a subgroup of Flavan 3-ol derivatives (FL63AG). Compared to catechins, they have an additional phenolic hydroxyl group. Catechin gallates are gallic acid esters of the catechins, and (-)-Epigallocatechin gallate (EGCG) is the most abundant catechin in green tea but not in black tea.
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Structure
Name	(+)-Gallocatechin or D-Gallocatechin; GC	(-)-Epigallocatechin or L-Epigallocatechin; EGC	(-)-Gallocatechin or L-Gallocatechin
B-ring stereo	↓	↓	↑
3-Hydroxyl stereo	↑	↓	↓
Gallate form
	(+)-Gallocatechin gallate or GCG	(-)-Epigallocatechin gallate or EGCG	(-)-Gallocatechin gallate
B-ring stereo	↓	↓	↑
3-Hydroxyl stereo	↑	↓	↓
Catechins	(+)-Catechin	(-)-Epicatechin	ent-Catechin